Medical Laboratory Scientist Licensure Requirements by State (2026)

Research publicationLast updated / verified: August 6, 2026

By the Castleport Test Prep Editorial Team · Castleport Research Last verified: August 6, 2026 · Data version 1.1

As of August 6, 2026, Castleport Research found 10 active state systems for individual laboratory personnel. Nine broadly require a state credential for MLS-level bench work. Tennessee is the tenth, but its 2021 private-laboratory exemption makes the rule conditional.

The medical laboratory scientist licensure requirements by state are not a flat 10-state list. Nine states broadly require the credential. Tennessee still licenses laboratory personnel, but many private-laboratory testing workers are exempt when their employer does not require it. No separate statewide individual MLS credential was identified in the other 40 states or in Washington, D.C. Puerto Rico also licenses medical technologists.

That is the whole answer. The rest of this page shows the source behind every active system, the exact title each regulator uses, what renewal requires, where older counts go wrong, and what the 40-state negative finding does—and does not—prove.

The count, at a glance

Table 1. Medical laboratory scientist licensure statistics, 50 states, August 2026
2026 classification	States	Share of 50 states
Broadly requires an individual state credential	9	18%
Runs a personnel-license system with a broad private-laboratory exemption (Tennessee)	1	2%
No separate statewide individual MLS credential identified	40	80%
Active state personnel-credential systems	10	20%

Source: Castleport Research 50-state classification. Starting directories: ASCLS Personnel Licensure and ASCP BOC State Licensure. Active systems and commonly miscounted jurisdictions were rechecked against the primary sources listed on this page. Washington, D.C., and Puerto Rico are shown separately and are not included in the 50-state percentages. Last verified August 6, 2026.

The 9 broad-mandate states: California, Florida, Hawaii, Louisiana, Montana, Nevada, New York, North Dakota, and West Virginia.

The 1 conditional state: Tennessee.

The licensed territory shown separately: Puerto Rico.

Dataset: Medical laboratory scientist licensure by state, 2026 CSV

Medical laboratory scientist licensure statistics and 2026 data

Nine of the 50 states—18%—broadly require an individual state credential for MLS-level bench work. Ten states—20%—still run an active laboratory-personnel credentialing system when Tennessee is included. Forty states—80%—had no separate statewide MLS credential identified in this review.

The 9-versus-10 split is the main finding. It separates a state that has a license board from a state that broadly makes the license mandatory. Tennessee belongs in the first group, but not the second, because of its 2021 private-laboratory exemption.

This count is about the worker, not the building. A clinical laboratory facility license does not count as an individual MLS license. A director license does not count either. That rule removes Georgia and Washington from personnel-license counts and keeps Rhode Island out after its old personnel law was repealed.

Which states require medical laboratory scientist licensure?

California, Florida, Hawaii, Louisiana, Montana, Nevada, New York, North Dakota, and West Virginia broadly require an individual state credential for MLS-level bench work. Tennessee runs a tenth system, but testing personnel in a private laboratory are exempt when the employer does not require the license. Puerto Rico also licenses medical technologists.

Two words matter here.

A personal license or certificate is a credential the worker must hold to practice under state law.

A facility license is permission for the laboratory itself to operate. It may place duties on the owner, director, or employer without issuing a personal credential to each bench worker.

Federal CLIA rules keep that split clear. For high-complexity testing, 42 CFR 493.1489 says each tester must:

“Possess a current license issued by the State in which the laboratory is located, if such licensing is required.”

The same state-license condition appears in the federal rule for moderate-complexity testing. Federal CLIA rules set the national personnel floor. State law decides whether a separate personal state credential sits on top of it.

Medical laboratory scientist licensure requirements by state: the full lookup

This table covers all 50 states, Washington, D.C., and Puerto Rico. A negative row means this review did not identify a separate statewide personal MLS credential. It does not mean the jurisdiction has no laboratory rules, no facility license, no employer standards, or no rules for a narrower job.

Table 2. Medical laboratory scientist licensure status by jurisdiction, August 2026
Jurisdiction	2026 classification	What the review found
Alabama	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Alaska	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Arizona	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Arkansas	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
California	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
Colorado	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Connecticut	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Delaware	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Florida	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
Georgia	No separate statewide MLS credential identified	Georgia licenses clinical laboratories and laboratory directors. No separate bench-level MLS credential was identified.
Hawaii	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
Idaho	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Illinois	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Indiana	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Iowa	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Kansas	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Kentucky	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Louisiana	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
Maine	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Maryland	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Massachusetts	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Michigan	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Minnesota	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Mississippi	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Missouri	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Montana	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
Nebraska	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Nevada	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
New Hampshire	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
New Jersey	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
New Mexico	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
New York	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
North Carolina	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
North Dakota	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
Ohio	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Oklahoma	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Oregon	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Pennsylvania	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Rhode Island	No separate statewide MLS credential identified	The former personnel-licensure chapter was repealed effective June 30, 2015. Facility licensing remains.
South Carolina	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
South Dakota	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Tennessee	Conditional state system	The license system remains active, but testing personnel in a private laboratory are exempt when the employer does not require the license.
Texas	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Utah	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Vermont	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Virginia	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Washington	No separate statewide MLS credential identified	Washington licenses Medical Test Sites and places personnel duties on the site. No separate bench-level MLS credential was identified.
West Virginia	Broad state credential	A personal state credential is broadly required for the MLS-level bench work covered by the state system, subject to stated exceptions.
Wisconsin	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
Wyoming	No separate statewide MLS credential identified	No separate statewide individual MLS credential was identified in this review. CLIA, facility, employer, or narrower role rules may still apply.
District of Columbia	No separate District-wide MLS credential identified	Shown separately and excluded from the 50-state percentages.
Puerto Rico	Territory license	Puerto Rico licenses Tecnólogos Médicos. It is shown separately and excluded from the 50-state percentages.

Source: Castleport Research, August 6, 2026. The active-system list was started from the current ASCLS and ASCP BOC directories. Every active system in Table 3 was then checked against its regulator, statute, or administrative rule. Georgia, Rhode Island, and Washington were checked directly because they are common sources of overcounting.

What are the medical laboratory scientist licensure requirements by state?

Every active system uses its own title, entry route, renewal clock, and continuing-education rule. Renewal ranges from one year in California, Louisiana, Montana, and West Virginia to a lifetime New York license paired with current registration. The same national certification can help in several states, but it is not a state license by itself.

Continuing education (CE) means approved learning completed to keep a credential current. Renewal means the state process used to keep the license or certificate active. Endorsement or reciprocity means a state may use an existing out-of-state credential as evidence, but the worker still applies to the new state.

Table 3. Active medical laboratory personnel credential systems, 2026
Jurisdiction	Credential title	Regulator	Main entry route	Renewal	Continuing education
California	Clinical Laboratory Scientist (CLS)	California Department of Public Health, Laboratory Field Services	Meet CDPH education, science-coursework, clinical training or qualifying experience, approved-exam, and California law-quiz requirements.	Every 1 year for licenses issued or renewed on or after January 1, 2026	12 contact hours per 1-year cycle
Florida	Clinical Laboratory Technologist	Florida Board of Clinical Laboratory Personnel	Meet the federal CLIA high-complexity personnel standard, Florida specialty rules, background screening, and the Board's application requirements.	Every 2 years	24 hours per 2-year cycle: 20 general, 2 medical errors, 1 laws and rules, and 1 HIV/AIDS; first-renewal exception applies
Hawaii	Medical Technologist (Medical Laboratory Scientist / Clinical Laboratory Technologist)	Hawaii Department of Health, State Laboratories Division	Hold certification from an agency accepted by the Hawaii Department of Health and meet one of the state's four education, training, or experience pathways.	Expires January 31 of each odd-numbered year	No separate state CE-hour total appeared in the current 2026 medical technologist instructions or fee sheet reviewed
Louisiana	Clinical Laboratory Scientist–Generalist (CLS-G; MLS or MT)	Louisiana State Board of Medical Examiners	Submit the required education and application records, background-check material, and a passing result from a national examination approved by the Board.	Every 1 year, for the January 1–December 31 calendar year	12 hours per year; first-renewal laws-and-rules course also applies
Montana	Clinical Laboratory Scientist	Montana Board of Allied Healthcare	Hold a bachelor's degree with at least 36 semester or 54 quarter hours in physical and biological sciences and pass an approved generalist examination.	Every 1 year; regular renewal period March 1–May 1	14 hours per year after the first full year of licensure
Nevada	Clinical Laboratory Technologist (state certificate)	Nevada Health Authority, Health Care Purchasing and Compliance Division	Meet one of the education, training, experience, and examination routes in Nevada Administrative Code chapter 652.	Every 2 years	2 CE units per 2-year cycle; 1 unit equals 10 hours, for 20 hours total
New York	Clinical Laboratory Technologist	New York State Education Department, Office of the Professions	Meet one of NYSED's seven education or alternative routes and the accepted examination requirement.	License is for life; registration is generally renewed every 3 years to practice	No recurring profession-specific CE-hour total was identified on the current NYSED clinical laboratory technologist pages reviewed
North Dakota	Medical Technologist / Clinical Laboratory Scientist	North Dakota Board of Clinical Laboratory Practice	Meet the Board's education requirements, pass an approved national certifying examination, and meet the current-practice, recent-exam, or continuing-education condition for initial licensure.	Every 2 years; renewal occurs in even-numbered years	24 hours per 2-year licensing period after the initial continuing-education period
Tennessee	Medical Laboratory Technologist	Tennessee Medical Laboratory Board	For a nonexempt setting, or for a person choosing to hold the license, meet the Board's education, training, examination, and application requirements.	Every 2 years for licensees	24 Board-approved hours per 2-year cycle for licensees
West Virginia	High Complexity Testing Personnel (HCTP)	West Virginia Department of Health, Office of Laboratory Services	Meet one of the state's CLIA-aligned routes based on laboratory education, science education plus training or experience, qualifying college credits plus experience, or military laboratory training.	Every 1 year	10 hours per year
Puerto Rico	Tecnólogo Médico / Medical Technologist	Puerto Rico Board of Examiners of Medical Technologists, Department of Health	Meet the Board's academic requirements, complete the revalidation examination or another Board-accepted licensing pathway, and receive a license under Act 167.	Recertification every 3 years	36 continuing-education hours per renewal period, including required subjects

Source: Castleport Research, compiled from the primary regulator, statute, or rule for each row. Puerto Rico is a territory and is not included in the 50-state count. Last verified August 6, 2026.

Your job has several legal names

If you search only for “medical laboratory scientist license,” several official pages are easy to miss. States use older titles, broader titles, and testing-complexity titles for work that may match an MLS job.

Table 4. Official credential titles used by active systems
If you are an MLS in…	The regulator calls the credential…
California	Clinical Laboratory Scientist (CLS)
Florida	Clinical Laboratory Technologist
Hawaii	Medical Technologist (Medical Laboratory Scientist / Clinical Laboratory Technologist)
Louisiana	Clinical Laboratory Scientist–Generalist (CLS-G; MLS or MT)
Montana	Clinical Laboratory Scientist
Nevada	Clinical Laboratory Technologist (state certificate)
New York	Clinical Laboratory Technologist
North Dakota	Medical Technologist / Clinical Laboratory Scientist
Tennessee	Medical Laboratory Technologist
West Virginia	High Complexity Testing Personnel (HCTP)
Puerto Rico	Tecnólogo Médico / Medical Technologist

Source: Castleport Research, from each regulator's current materials. Last verified August 6, 2026.

The 10 states and Puerto Rico use six main title families. North Dakota uses two names for the same MLS-level license. Hawaii lists Medical Laboratory Scientist as an alternate name under Medical Technologist, while several other systems do not use the words “medical laboratory scientist” at all.

What is the Tennessee exception, and why does it matter?

Tennessee has an active Medical Laboratory Board and still issues personnel licenses. But Public Chapter 495, signed May 25, 2021, exempts testing personnel who work in a private laboratory when the employer does not require the state license. Directors and supervisors in a state-licensed laboratory remain subject to licensure.

This is why a flat “10 states require an MLS license” count misses the real rule.

The Tennessee Medical Laboratory Board's legislative update says all of the following:

A private-laboratory employer may let testing personnel work without the state license.
The employer may still require the license.
Testing personnel may hold the license by choice.
Directors and supervisors in a state-licensed laboratory must keep a current license.
Exempt testing personnel still must meet federal laboratory rules.

That makes Tennessee a conditional system. The board and license are real. The broad legal mandate for private-laboratory bench staff is not.

For a Tennessee worker, the practical question is not only “Does Tennessee have a license?” It is also “Is this laboratory covered by the private-laboratory exemption, and does this employer require the credential?”

What does each active state system require?

The fastest way to compare the active systems is to look at four things: the regulator's title, the main entry route, how often the credential must be renewed, and the CE total. The details below add the current 2026 changes that a one-line state list cannot show.

California — Clinical Laboratory Scientist

California law requires licensed clinical laboratories to use state-licensed testing personnel. A national credential by itself is not a California license.

The California Department of Public Health CLS page requires applicants to meet California's education, science-coursework, and clinical-training or experience rules, pass an approved examination, complete the California law quiz, and receive the state license.

2026 change: California moved affected clinical laboratory personnel licenses and certificates to a one-year renewal period beginning January 1, 2026. Licensed scientists complete 12 contact hours of CE for the one-year cycle. Source: CDPH personnel renewal.

Florida — Clinical Laboratory Technologist

Florida licenses technologists through the Florida Board of Clinical Laboratory Personnel. Applicants must satisfy the federal high-complexity CLIA personnel standard, meet Florida's specialty rules, complete background screening, and finish the state application steps.

2026 change: Chapter 2026-134 took effect July 1, 2026. It made the applicable federal CLIA personnel qualifications the minimum state baseline. Florida did not erase its own license, specialty categories, background check, or application process.

Renewal is every two years. The current technologist renewal page lists 24 CE hours: 20 general, 2 medical errors, 1 Florida laws and rules, and 1 HIV/AIDS. A first-renewal exception applies.

Hawaii — Medical Technologist

Hawaii's primary title is Medical Technologist. Its current fee sheet also lists Medical Laboratory Scientist and Clinical Laboratory Technologist as alternate names in that category.

The 2026 Hawaii application instructions require certification from an agency accepted by the Department of Health and one of four education, training, or experience pathways.

Licenses expire on January 31 of each odd-numbered year. We did not find a separate CE-hour total in the current 2026 medical technologist instructions or the current fee and expiration sheet. That is a document-review finding, not a claim that no other Hawaii rule could apply.

Louisiana — Clinical Laboratory Scientist–Generalist

Louisiana law is direct: La. R.S. 37:1318 bars a person from doing the work of a clinical laboratory scientist-generalist without a current license unless an exemption applies.

The Louisiana State Board of Medical Examiners uses CLS-Generalist (MLS or MT) for the MLS-level license. Applicants submit the required records and a passing result from a Board-approved national examination. The license runs from January 1 through December 31. The current annual CE total is 12 hours, with a separate first-renewal laws-and-rules course.

2026 bill status: HB 1216 would have renamed the credential Medical Laboratory Scientist and changed other parts of the personnel law. The House passed it 97–0 on April 21, 2026. The Senate Health and Welfare Committee deferred it indefinitely on May 20, 2026. It did not become law, so the current title remains Clinical Laboratory Scientist–Generalist. Source: official bill history.

Montana — Clinical Laboratory Scientist

Montana requires an active license for covered clinical laboratory personnel. The current regulator is the Montana Board of Allied Healthcare.

The 2026 licensure checklist requires a bachelor's degree with at least 36 semester or 54 quarter hours in physical and biological sciences and a generalist examination from a national certifying body recognized by the Board.

Renewal is annual. The regular renewal period is March 1 through May 1. The CE requirement is 14 hours each year after the first full year of licensure.

Nevada — Clinical Laboratory Technologist

Nevada uses the word certification for its personal laboratory credential. Before working at a technical level, a person applies for the state certificate under Nevada Administrative Code chapter 652.

The rules provide education, training, experience, examination, endorsement, and provisional routes. The certificate is effective for two years. Technologists complete 2 CE units during the two years before renewal, and Nevada defines one unit as 10 hours. That makes the total 20 hours.

The current enforcement agency named in NRS chapter 652 is the Health Care Purchasing and Compliance Division of the Nevada Health Authority.

New York — Clinical Laboratory Technologist

New York separates the professional license from registration. The license is for life unless it is suspended, revoked, or annulled. A technologist must keep current registration to practice, and registration is generally renewed every three years.

The NYSED requirements page lists seven education or alternative routes. Current ASCP MLS or qualifying ASCPi MLS certification can satisfy the examination requirement. New York also names a California CLS license or Hawaii Medical Technologist license in good standing as an accepted education alternative.

New York offers both limited permits and provisional permits for applicants who meet the stated conditions. Those permits are setting-specific and require supervision. We did not identify a recurring profession-specific CE-hour total on the current NYSED clinical laboratory technologist pages reviewed.

North Dakota — Medical Technologist / Clinical Laboratory Scientist

North Dakota's rules use both Medical Technologist and Clinical Laboratory Scientist for the MLS-level license.

The current licensure rule requires the application, fee, proof of education, and an approved national certifying examination. It also requires a recent exam, recent practice, or qualifying continuing education for initial licensure.

Licenses renew every two years in even-numbered years. The current continuing-education rule requires 24 contact hours for the two-year period after the initial CE period. Provisional permits are available under the Board's rules.

Tennessee — Medical Laboratory Technologist

Tennessee's license remains available, and licensees renew every two years with 24 Board-approved CE hours. The Medical Laboratory Board page carries the current renewal and CE information.

The private-laboratory exemption controls whether many testing personnel must hold it. A person in a nonexempt setting, or a worker whose employer requires the license, still follows the Board's education, training, examination, and application route.

West Virginia — High Complexity Testing Personnel

West Virginia requires personnel performing moderate- or high-complexity testing in a CLIA-certified laboratory to hold the matching state license. Its Office of Laboratory Services says an unlicensed worker found during a survey is assessed a $100 penalty fee and the facility may be cited.

2026 change: The revised 64CSR57 rule took effect July 1, 2026. Separate MLS and MLT categories were replaced by testing-complexity categories. High Complexity Testing Personnel (HCTP) is now the main category for high-complexity bench testing.

The current rule package lists several CLIA-aligned routes based on laboratory education, science education plus training or experience, qualifying credits plus experience, or military laboratory training. Certification can satisfy one route, but it is not required for every route. Renewal is annual with 10 CE hours.

Puerto Rico — Tecnólogo Médico

Puerto Rico licenses Tecnólogos Médicos under Act 167 of 1988, as amended. The law creates the Board of Examiners, defines the license, and authorizes the revalidation examination.

The Board's 2026 academic resolution sets minimum course requirements for permanent-license applicants. The current renewal sheet lists 36 hours of continuing education and required subjects. Act 167 provides for recertification every three years.

Puerto Rico is shown because it has an active personal credential. It is not a state, so it is not included in the 9-of-50 or 10-of-50 percentages.

What rules apply in the 40 states with no separate MLS license?

No separate statewide MLS credential does not mean no rules. Federal CLIA personnel standards still apply to moderate- and high-complexity testing. Facility rules, employer hiring standards, accreditation, and narrower state laws may add more.

CLIA stands for the Clinical Laboratory Improvement Amendments. The federal program applies to laboratories that test human specimens for health assessment or for the diagnosis, prevention, or treatment of disease, subject to stated exceptions.

CLIA groups tests by complexity. The two personnel rules most relevant here are:

42 CFR 493.1423 for moderate-complexity testing.
42 CFR 493.1489 for high-complexity testing.

The federal personnel revisions in CMS-3326-F took effect December 28, 2024. Three points matter for this page:

A nursing degree is listed as a route for moderate-complexity testing, but not as a stand-alone route for high-complexity testin
High-complexity routes now state the education, training, and military pathways directly in the rul
Grandfather provisions protect people who were qualified and continuously serving in the covered role on and after December 28, 202

The Federal Register final rule gives December 28, 2024 as the effective date for the personnel provisions.

Three other layers can still control the job:

The laboratory's facility rules. A state may place personnel duties on the owner or director even when it does not issue a personal MLS license.
The employer. A hospital or reference laboratory may require ASCP, AMT, or another credential even when state law does not.
Accreditation and competency rules. A laboratory may have personnel, training, supervision, and competency duties beyond the minimum entry route.

Is ASCP certification the same as a state license?

No. Certification is issued by a private credentialing body. A state license or certificate is issued under state law. A national credential may satisfy one part of a state application, but the worker still must receive the state credential before practicing where state law requires it.

The practical difference is simple:

In a state with no separate personal MLS credential identified: The worker still must fit the applicable CLIA route and any employer, facility, accreditation, or narrower state rule.
In a broad-mandate state: National certification alone is not the final legal permission to practice. The state application still matters.
In California: An approved examination is one part of a separate CDPH route.
In New York: Current ASCP MLS, qualifying ASCPi MLS, or AMT MLS status can satisfy parts of the state route, but NYSED still issues the license.
In West Virginia: Certification can satisfy one HCTP route, but other routes exist.

Do not use a forum answer or a job listing as proof that a state license is active. Use the regulator's current page and verify the status before a start date.

Does an MLS license transfer from one state to another?

No active system on this page provides an automatic nationwide transfer. A worker applies to the new jurisdiction and proves that the new jurisdiction's route is met. Endorsement, reciprocity, or substantial equivalency may shorten the proof, but it does not turn one state's license into another state's license.

Examples:

Montana can evaluate an out-of-state route under its current licensing process, but the applicant still receives a Montana license.
New York accepts a California CLS or Hawaii Medical Technologist license in good standing as one education alternative.
California applies its own coursework, training or experience, examination, and law-quiz requirements.
North Dakota has provisional permits under its rules.
New York has limited and provisional permits for applicants who meet the stated conditions.
West Virginia has a trainee category for qualifying workers in high-complexity laboratories.

Federal law points to the state where the laboratory is located. A remote employer's home office or the worker's home address does not replace the rule that applies at the testing site.

Why do published counts of MLS licensure states disagree?

Counts disagree when a source mixes personal credentials with facility licenses, keeps a repealed law, treats Tennessee as fully mandatory, or counts Puerto Rico as a state. The primary-source check below explains each common mismatch.

Table 5. The primary-source reasons MLS licensure counts disagree
Jurisdiction	What the primary source shows	Castleport classification
Tennessee	Active personnel-license system plus a broad private-laboratory exemption	Conditional system: counted among the 10 active systems, but not among the 9 broad mandates
Georgia	Clinical laboratory facility license and licensed director	Not counted as a separate bench-level MLS credential
Rhode Island	Former personnel chapter repealed June 30, 2015; facility law remains	Not counted as a current personnel-license state
Washington	Medical Test Site facility license; personnel qualifications are duties of the site owner and director	Not counted as a separate bench-level MLS credential
Puerto Rico	Personal Tecnólogo Médico license in a U.S. territory	Shown separately; not included in the 50-state percentages

Source: Castleport Research, using the Tennessee Medical Laboratory Board, Georgia administrative rules, Rhode Island statutes and repeal notes, Washington medical-test-site rules, and Puerto Rico Act 167. Last verified August 6, 2026.

Georgia licenses the laboratory and director

Georgia's clinical laboratory rules require a clinical laboratory license and a licensed laboratory director. The rules also set personnel qualifications that the laboratory must follow.

This review did not identify a separate statewide personal credential issued to each bench-level MLS. Counting Georgia as a personal-licensure state mixes the facility's duty with the worker's own credential.

Rhode Island repealed its personnel chapter in 2015

Rhode Island once had a Clinical Laboratory Science Practice Act. The current statute index marks the chapter's operative sections as repealed. The repeal took effect June 30, 2015.

Rhode Island still regulates clinical laboratories as facilities under a separate chapter. The facility system does not revive the old personal MLS license.

Washington licenses Medical Test Sites

Washington's law defines a test site as a facility or site that analyzes human materials. Its rules require the site owner to have a director and competent technical personnel who meet federal personnel standards.

That is a facility system. This review did not identify a separate statewide bench-level MLS credential.

Puerto Rico is licensed but not a state

Puerto Rico has a personal medical technologist license. It belongs in a national reference table, but not in a percentage whose denominator is the 50 states.

Our counting rule

A jurisdiction counts as an active individual credential system only when it issues a personal credential for covered laboratory personnel. It counts as a broad mandate only when that credential is broadly required for the MLS-level bench work in scope, subject to ordinary statutory exceptions.

A facility license does not count. A director-only license does not count. A repealed personnel law does not count. A territory is shown separately from the 50-state percentages.

What changed in 2024, 2025, and 2026?

Four rule changes and one failed bill matter most for current readers: federal CLIA personnel revisions took effect December 28, 2024; California moved to annual renewal January 1, 2026; Florida changed its minimum qualification baseline July 1, 2026; West Virginia replaced its MLS and MLT categories July 1, 2026; and Louisiana's proposed title change did not pass.

December 28, 2024 — federal CLIA personnel revisions. The personnel sections of CMS-3326-F took effect. The current rules list updated moderate- and high-complexity routes and grandfather continuously serving workers who met the stated conditions.

January 1, 2026 — California annual renewal. Affected laboratory personnel licenses and certificates moved to a one-year period. Licensed scientists complete 12 CE hours for the annual cycle.

July 1, 2026 — Florida Chapter 2026-134. Applicable CLIA personnel qualifications became the minimum state baseline for technologist and technician licensure. Florida's state license, specialty rules, screening, and application process remain.

July 1, 2026 — West Virginia 64CSR57 update. The state replaced separate MLS and MLT categories with testing-complexity categories. HCTP is now the high-complexity bench category.

May 20, 2026 — Louisiana HB 1216 deferred indefinitely. The bill would have renamed CLS-Generalist to Medical Laboratory Scientist. It passed the House but did not become law.

The workforce is large. The U.S. Bureau of Labor Statistics reported about 351,200 clinical laboratory technologist and technician jobs in 2024, a $61,890 median annual wage in May 2024, and about 22,600 openings per year projected from 2024 through 2034. BLS combines technologists and technicians in those figures, so the numbers are context—not a count of MLS workers alone.

How we built this dataset

We started with the two current national licensure directories, treated their list as a claim to test, and checked each active system against its regulator, statute, or rule. We then applied one counting rule across every jurisdiction and directly rechecked the states most often confused with personal licensure.

Here is the method.

Starting point.** We used the current ASCLS Personnel Licensure and ASCP BOC State Licensure pages. Both identify the same 10 state systems and Puerto Rico.

Unit of analysis.** The counted unit is a personal credential for bench-level laboratory personnel at the MLS, technologist, or high-complexity-testing level. The count is not about laboratory directors, supervisors, phlebotomists, cytotechnologists, histotechnologists, or facility licenses.

Active-system check.** For each of the 10 states, we opened a current regulator page, statute, administrative rule, or official 2026 instruction document. Puerto Rico was checked against Act 167 and current Department of Health materials.

Broad-versus-conditional rule.** A system is broad when the credential is broadly required for the work in scope. A system is conditional when the state still issues the credential but a large statutory exemption changes the ordinary rule. Tennessee is the only conditional system in this dataset.

Negative-state rule. A negative row says “no separate statewide credential identified in this review.”** It does not say that no rule can exist. Negative rows were based on the current national directories plus targeted checks where a state is often miscounted. We did not claim to prove an absolute negative by reading every page of every state code.

Facility-versus-person check.** Georgia and Washington were checked directly because their facility rules are often mistaken for personal licensure. Rhode Island was checked because its old personnel chapter still appears on stale lists.

Exact titles.** We recorded the title used by the regulator, even when it differs from Medical Laboratory Scientist.

Current dates.** Every row carries the August 6, 2026 verification date. Recent changes in California, Florida, Louisiana, Montana, Nevada, Tennessee, West Virginia, and Puerto Rico received an extra status check.

Reproducibility.** The CSV uses the same fields for each jurisdiction: classification, active-system status, broad-mandate status, credential title, entry route, exam or certification role, renewal cycle, CE, regulator, source URLs, verification date, notes, and confidence.

What this data shows—and what it does not

This dataset shows where Castleport Research identified an active personal laboratory credential system and where that system broadly reaches MLS-level bench work. It does not decide whether one worker qualifies, replace a regulator, or cover every laboratory job title.

This is about bench-level MLS or high-complexity technologist work. Directors, supervisors, technicians, phlebotomists, cytotechnologists, histotechnologists, pathologists' assistants, point-of-care staff, and research workers can have different rules.

A negative row is a dated research result. “No separate statewide credential identified” is not the same as “the state has no laboratory law.” Federal CLIA, facility rules, employer policy, accreditation, title restrictions, and narrower job rules may still apply.

Exemptions differ. Tennessee has the largest exemption relevant to this count, but broad-mandate states also have exemptions for students, trainees, research settings, federal facilities, or other narrow cases.

Fees are left out of the main comparison. Fees can change faster than statutes and renewal cycles. The dataset focuses on the durable parts of the route.

Hawaii's CE line is a document-review result. No separate CE-hour total appeared in the current 2026 medical technologist instructions or fee sheet reviewed. The Hawaii regulator controls if another current rule applies.

Bills are not laws. Louisiana HB 1216 is described as failed 2026 legislation. Its proposed title change is not current law.

This is educational, not legal advice. The current statute, rule, and regulator control. Use this page to find the right question and source, then confirm your own status before working.

Frequently asked questions

How many states require medical laboratory scientist licensure?

Nine states broadly require an individual credential for MLS-level bench work: California, Florida, Hawaii, Louisiana, Montana, Nevada, New York, North Dakota, and West Virginia. Tennessee runs a tenth system, but its private-laboratory exemption makes it conditional. Puerto Rico also licenses medical technologists.

Which states do not require an MLS license?

No separate statewide individual MLS credential was identified in 40 states or Washington, D.C., in this review. That finding does not remove federal CLIA rules, laboratory-facility duties, employer standards, accreditation, or narrower state laws.

Do I need an MLS license in Tennessee?

A Tennessee testing worker in a private laboratory is exempt when the employer does not require the state license. The employer may still require it. Directors and supervisors in a state-licensed laboratory remain subject to licensure.

Is ASCP certification the same as a state license?

No. ASCP certification is a private credential. A state license or certificate is legal authorization issued under state law. Certification may satisfy part of a state route, but it does not replace the state credential where one is required.

Does my ASCP certification work in California?

It is not enough by itself. California requires its own education, training or experience, approved-exam, law-quiz, application, and license steps through CDPH Laboratory Field Services.

Do I need an MLS license in Texas, Ohio, or Pennsylvania?

No separate statewide personal MLS credential was identified in Texas, Ohio, or Pennsylvania in this review. The worker still must meet the applicable CLIA route and any employer, facility, accreditation, or narrower state rule.

Can I work while a state application is pending?

Sometimes, but only under a state-authorized permit or trainee route. New York has limited and provisional permits, North Dakota has provisional permits, and West Virginia has a trainee category. Each has its own conditions and supervision rules.

Does CLIA replace state licensure?

No. CLIA sets the federal personnel floor. Its moderate- and high-complexity rules also require a current state license when the state where the laboratory is located requires one.

How to cite this page

Suggested citation: Castleport Test Prep Editorial Team. “Medical Laboratory Scientist Licensure Requirements by State (2026).” Castleport Research. Data version 1.1. Last verified August 6, 2026. https://castleporttestprep.com/research/medical-laboratory-scientist-licensure-requirements-by-state/

APA: Castleport Test Prep Editorial Team. (2026). Medical laboratory scientist licensure requirements by state (2026) (Data set version 1.1). Castleport Research. https://castleporttestprep.com/research/medical-laboratory-scientist-licensure-requirements-by-state/

This block is neutral attribution information in the same form used by research and data publishers.

Who made this, and why

Castleport Research is the independent research and reference section published by Castleport Test Prep. It puts scattered public records into one dated, sourced reference so students, working professionals, schools, employers, and writers can check the rule without opening many separate pages.

Who: The Castleport Test Prep Editorial Team compiled and wrote this page.

How: We compared the two current national directories, verified the active systems against primary regulator and legal sources, applied one counting rule, recorded each regulator's title, and dated the result. Where a negative could not be proven as an absolute, we said exactly what the review identified.

Why: People moving for work, new graduates, travel professionals, and schools writing licensure disclosures need a count that separates a real state license system from a broad legal requirement.

This page contains no paid placement, affiliate link, lead form, or commercial recommendation.

Primary sources

Federal

National starting directories

State and territory sources

Version history

Version history
Date	Version	Change
August 6, 2026	1.0	Original 50-state classification published.
August 6, 2026	1.1	Corrected the Louisiana bill status, current Montana and Nevada regulator names, New York permit wording, federal CLIA summary, and Puerto Rico sourcing; added the full jurisdiction lookup; tightened the negative-state method.

Source: Castleport Research, verified August 6, 2026.

The active systems are rechecked quarterly. The complete 50-state sweep is repeated annually. California, Florida, Louisiana, Tennessee, West Virginia, and Puerto Rico stay on priority watch because of recent changes.