ASCP Medical Laboratory Scientist (MLS) Vocabulary Game
Exam terms with clues and explanations by OpenExamPrep.
About the ASCP Medical Laboratory Scientist (MLS) Vocabulary Game
A free word game for the ASCP Medical Laboratory Scientist (MLS) exam. Each round shows a clue for one of 44 exam terms across 7 topics. Recall the term, spell it out, then read a short explanation. Rounds pick a random term, so you can keep playing as long as you like.
How to Play
- 1Read the clue and type a term with the right number of letters (3 to 6). Abbreviations count: type the letters only.
- 2Press Check Answer or Enter. Each letter changes color to show how close you are.
- 3You have 6 tries. Stuck? Need a hint? asks the AI tutor for a nudge without giving the term away.
- 4After the round, read the explanation, ask the AI to explain it, share your result, or press Next.
- ARight letter, right spot
- AIn the term, wrong spot
- ANot in the term
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Topics in the ASCP Medical Laboratory Scientist (MLS) Vocabulary Game
Blood Banking
Urinalysis and Body Fluids
Chemistry
Hematology
Immunology
Microbiology
Laboratory Operations
Sources for these terms (44)
- Medical Laboratory Scientist, MLS(ASCP) and MLS(ASCPi) Examination Content Guideline (Revised September 25, 2025) · Source checked 2026-11-02
- 42 CFR Part 493 — Laboratory Requirements (Clinical Laboratory Improvement Amendments) · Source checked 2026-11-02
- 21 CFR Part 630 — Requirements for Blood and Blood Components Intended for Transfusion or for Further Manufacturing Use · Source checked 2026-11-02
- 21 CFR Part 640 — Additional Standards for Human Blood and Blood Products · Source checked 2026-11-02
- 21 CFR Part 660 — Additional Standards for Diagnostic Substances for Laboratory Tests · Source checked 2026-11-02
- 21 CFR Part 862 — Clinical Chemistry and Clinical Toxicology Devices · Source checked 2026-11-02
- 21 CFR Part 864 — Hematology and Pathology Devices · Source checked 2026-11-02
- 21 CFR Part 866 — Immunology and Microbiology Devices · Source checked 2026-11-02
- 29 CFR § 1910.1450 — Occupational Exposure to Hazardous Chemicals in Laboratories · Source checked 2026-11-02
- CDC OneLab REACH — Core Microbiology Skills: How to Perform a Gram Stain · Source checked 2026-11-02
- CDC OneLab REACH — Staphylococci Identification Chart · Source checked 2026-11-02
- CDC OneLab REACH — Aerobic Gram-Negative Rods Flowchart · Source checked 2026-11-02
- CDC — Laboratory Testing for Methicillin (oxacillin)-resistant Staphylococcus aureus (MRSA) · Source checked 2026-11-02
- CDC — Vancomycin-resistant Enterococci (VRE) Basics · Source checked 2026-11-02
- CDC — About ESBL-producing Enterobacterales · Source checked 2026-11-02
- CDC DPDx — Diagnostic Procedures for Blood Specimens: Staining Blood Smears · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Coombs test · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Blood typing · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Hemolytic disease of the newborn · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Urinary casts · Source checked 2026-11-02
- MedlinePlus Medical Test — Ketones in Urine · Source checked 2026-11-02
- MedlinePlus Medical Test — Semen Analysis · Source checked 2026-11-02
- MedlinePlus Medical Test — Cerebrospinal Fluid (CSF) Analysis · Source checked 2026-11-02
- MedlinePlus Medical Test — Lipase Tests · Source checked 2026-11-02
- MedlinePlus Medical Test — BUN (Blood Urea Nitrogen) · Source checked 2026-11-02
- MedlinePlus Medical Test — Sodium Blood Test · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Total iron binding capacity · Source checked 2026-11-02
- MedlinePlus Medical Test — Cholesterol Levels · Source checked 2026-11-02
- MedlinePlus Medical Test — Gamma-glutamyl Transferase (GGT) Test · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Lead poisoning · Source checked 2026-11-02
- MedlinePlus Medical Test — MCV (Mean Corpuscular Volume) · Source checked 2026-11-02
- MedlinePlus Medical Test — RDW (Red Cell Distribution Width) · Source checked 2026-11-02
- MedlinePlus Medical Test — Erythrocyte Sedimentation Rate (ESR) · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Paroxysmal nocturnal hemoglobinuria (PNH) · Source checked 2026-11-02
- MedlinePlus Medical Test — Partial Thromboplastin Time (PTT) Test · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Prothrombin time (PT) · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Disseminated intravascular coagulation (DIC) · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Sickle cell test · Source checked 2026-11-02
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- MedlinePlus Medical Encyclopedia — ELISA blood test · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Histocompatibility antigen test · Source checked 2026-11-02
- MedlinePlus Medical Test — Gram Stain · Source checked 2026-11-02
- MedlinePlus Medical Encyclopedia — Skin lesion KOH exam · Source checked 2026-11-02
About the ASCP MLS Exam
The ASCP MLS certification examination is a 100-question, 2-hour-30-minute computer adaptive test for Medical Laboratory Scientist certification. It covers Blood Banking, Chemistry, Hematology, Microbiology, Urinalysis and Other Body Fluids, Immunology, and Laboratory Operations using theoretical and procedural multiple-choice questions with one best answer.
Exam sponsor: ASCP Board of Certification (ASCP BOC). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Questions
100 questions
Time Limit
2 hours 30 minutes
Passing Score
Scaled score 400 on the ASCP BOC 100-999 scale
Reported exam pass rate: Not published as a current universal first-time rate on the credential page. Use current ASCP BOC statistics only when citing a specific year; do not treat old statistics as current. Exam sponsor website
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Frequently Asked Questions
Is the ASCP MLS vocabulary game free?
Yes. The game is free to play with no sign-up. Signing in adds AI explanations for any term.
How does the ASCP MLS vocabulary game work?
Each round shows a clue for one of 44 ASCP MLS terms. Guess the term in six tries: green means the right letter in the right spot, yellow means the letter is in the term but in another spot, and gray means it is not in the term. After the round, read the explanation and play the next term.
Where do the ASCP MLS terms come from?
OpenExamPrep researched each term from the ASCP Board of Certification (ASCP BOC) content outline and primary sources, listed under Sources on this page. The game is independent study material, not an official exam resource.
How many questions are on the ASCP MLS exam?
The ASCP BOC MLS and MLS(ASCPi) certification examination is composed of 100 multiple-choice questions in a 2-hour-30-minute time frame.
Is the ASCP MLS exam computer adaptive?
Yes. ASCP BOC states that the MLS exam is administered using computer adaptive testing, where item difficulty adapts based on the candidate's performance.