ASCP Certification for Internationally Trained Medical Laboratory Scientists in the US
By Muntasir Minhaz • Published Aug 19, 2026
ASCP Board of Certification (BOC) credentials prove a medical laboratory scientist meets US practice standards, and several employers and states require them, or an equivalent, before you can work. Internationally trained candidates qualify through a credential evaluation route rather than by graduating a NAACLS-accredited US program, but you must confirm the exact route and its requirements directly with ASCP since eligibility rules are reviewed periodically.
🔬 ASCP BOC certification (MLS or MT) is separate from any state medical laboratory license.
📋 International candidates submit a foreign transcript through a recognized credential evaluation service.
🎓 NAACLS accredits both US and non-US clinical laboratory science programs, which affects which route applies to you.
📩 Confirm your specific eligibility route and any experience requirement directly with ASCP before applying.
What ASCP BOC certification is for
The American Society for Clinical Pathology runs a Board of Certification (BOC) that certifies medical laboratory scientists (MLS), medical laboratory technicians (MLT), and several specialist categories. Certification is not automatically the same as a state license. A handful of states require their own separate license for laboratory personnel, and some of those states accept ASCP BOC certification as evidence you meet their standard, while others run their own additional review.
Employers commonly require ASCP BOC certification even in states with no license requirement, since hospital and reference laboratories use it as a hiring standard tied to their own accreditation under federal clinical laboratory rules.
How international training fits in
A candidate who graduated a NAACLS-accredited US program applies for ASCP BOC certification through the standard domestic route. A candidate trained outside the US instead needs a credential evaluation confirming their degree and coursework are equivalent to a US bachelor's degree in medical laboratory science or a closely related science field, typically completed through a recognized credential evaluation service.
NAACLS , the same body that accredits US laboratory science programs, also accredits a number of programs outside the US directly. If your program holds NAACLS accreditation itself, that simplifies your ASCP eligibility review compared with a program that has no NAACLS relationship at all.
Certification categories you may encounter
ASCP BOC issues several distinct credentials, and which one applies to you depends on your degree level and specialty training, not just your country of origin. Generalist credentials include Medical Laboratory Scientist (MLS) for a bachelor's-level scope and Medical Laboratory Technician (MLT) for an associate-level scope. Specialist and categorical credentials exist for narrower fields such as histotechnology, cytotechnology, and blood banking, each with its own eligibility requirements layered on top of the general international pathway.
Matching yourself to the right category before you request a credential evaluation saves time, since the evaluation service needs to know which US equivalent degree and coursework you are being measured against.
Choosing a credential evaluation service
Use an evaluator that belongs to NACES, the National Association of Credential Evaluation Services, since these are the evaluators most US certification bodies and state licensing boards recognize without extra review. A general translation of your transcript is not the same as a NACES-member course-by-course equivalency evaluation, and submitting the wrong type of report is a common cause of delay.
What to expect from the process
Order an official transcript evaluation through a NACES-member service, converting your foreign coursework into US semester-hour equivalents.
Confirm whether your degree, coursework, and any clinical laboratory work experience meet ASCP's current international eligibility route. Routes and their science-credit and experience requirements are set by ASCP and reviewed periodically, so confirm the current version rather than relying on an older summary.
Apply for the relevant BOC exam once ASCP confirms you meet a route.
Check your target state separately for any additional state licensure step, since ASCP certification and a state clinical laboratory license are not always the same requirement.
After you are certified
ASCP BOC certification alone does not include employment authorization.
You still need a valid work visa, or existing work authorization tied to your program if you are finishing US training on OPT, before a US laboratory can hire you. Build your certification timeline around your visa timeline rather than treating them as separate tracks.
Where MLS-certified professionals work
Hospital laboratories, independent reference laboratories, blood banks, and public health labs are the most common employers for MLS and MLT certified staff. Job postings in these settings frequently list ASCP BOC certification, or active progress toward it, as a condition of hire rather than a preference, which is why confirming your eligibility route before you finish your degree program saves time once you start job hunting.
Keeping your certification active
ASCP BOC certification is not a one-time credential. Certified professionals complete periodic continuing education to keep their certification active, and letting it lapse affects your ability to keep working in a role that requires it. Build continuing education into your plan once you are certified rather than treating certification as a finished task.