Medical Laboratory Scientist
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ExploreAbout this exam
The Medical Laboratory Scientist (MLS) credential is a certification for laboratory professionals, and the ASCP BOC Initial Certification Preparation page is the starting point for candidates preparing for the BOC examination. ASCP organizes its education catalog by content area, and the areas most relevant to MLS candidates include Blood Banking, Clinical Chemistry, Coagulation, Hematology, Immunology, Laboratory Administration, Microbiology, Molecular Diagnostics, Phlebotomy, Transfusion Medicine, and Pathology Informatics. Each of these has a dedicated content-area overview page on ascp.org that describes the learning resources available. The exam itself tests the knowledge and judgment a laboratory professional needs across these technical and administrative areas, so preparation should be broad rather than limited to one department. ASCP offers several preparation routes: the BOC Initial Certification Preparation hub, the MLS Online Review in the online education catalog, LabQ, case reports, and CE packages. After certification, the Credential Maintenance Program (CMP) covers ongoing requirements, and Easy CMP supports that work. Candidates should confirm current eligibility requirements, application procedures, exam format, and fees directly with the ASCP BOC, since this page is an independent study resource and is not affiliated with or endorsed by ASCP. Use the domain pages here to build a study plan that matches the content areas ASCP publishes, and check the official site for authoritative details.
What you'll study
About Medical Laboratory Scientist preparation
What does the MLS certification exam cover?
ASCP's education catalog lists content areas including Blood Banking, Clinical Chemistry, Coagulation, Hematology, Immunology, Laboratory Administration, Microbiology, Molecular Diagnostics, Phlebotomy, Transfusion Medicine, and Pathology Informatics. Expect the exam to draw from these technical and administrative areas rather than a single department. Review the official BOC materials for the authoritative content outline and any weighting.
How long is the exam and how many questions are on it?
This page does not state a question count or time limit. Those details come from the ASCP BOC, which publishes the current examination content guidelines and testing details. Check the BOC Initial Certification Preparation page on ascp.org before you schedule, and do not rely on figures from older study guides or prep courses.
How should I order my studying?
Start with the highest-volume areas: Hematology, Clinical Chemistry, Microbiology, and Blood Banking, since they carry the most technical content. Then layer in Coagulation, Immunology, and Transfusion Medicine, which overlap with Blood Banking and Hematology. Finish with Laboratory Administration, Phlebotomy, and Pathology Informatics, which are easier to review in short sessions.
What is the most common reason candidates fail?
Weak coverage of the lower-volume areas. Candidates often over-study hematology morphology and under-prepare for laboratory administration, informatics, and quality concepts, then lose easy points. Another frequent problem is memorizing facts without practicing interpretation: exam items often ask what a result means and what to do next, not just what a value is.
Can I retake the exam if I do not pass?
Retake policy, waiting periods, and any fees are set by the ASCP BOC and are not stated on this page. Confirm the current policy on ascp.org before you apply, and note that requirements can change between application cycles. Plan your first attempt as if it is the only one.
What official preparation resources exist?
ASCP lists BOC Initial Certification Preparation, the MLS Online Review under online education, LabQ, case reports, and CE packages. These are ASCP products; this site is independent and not affiliated with them. Use them alongside your own notes and textbook review, and confirm which resources match the current exam content outline.
What happens after I am certified?
ASCP lists a Credential Maintenance Program (CMP) for laboratory professionals, with Easy CMP as an online tool in its education catalog. CMP covers the continuing education and maintenance requirements that keep a credential active. Check the CMP page on ascp.org for the specific requirements, accepted activities, and reporting deadlines that apply to you.
Is this site affiliated with ASCP?
No. This is an independent study platform. The domain list and resource names here are drawn from ASCP's public education catalog for orientation only, and no endorsement or affiliation is claimed. Always treat ascp.org and the BOC as the authoritative source for eligibility, application, scheduling, scoring, and policy questions.