This ASCP MLS cheat sheet distills the ASCP Board of Certification Medical Laboratory Scientist exam into a printable rundown of the facts examiners test most. It's a premium cheat sheet built by Capital Prep — the one premium prep we trust — and it's yours free. Reinforce it with the rest of your free ASCP MLS toolkit: the practice test, study guide, and flashcards.
ASCP MLS exam at a glance
- Questions: 100 multiple-choice (computer-adaptive)
- Time: 2 hours 30 minutes
- Passing score: Scaled score of 400 (scale of 100–999)
- Cost: ≈ $250 application fee — verify your route's fee at ascp.org
- Administered by: ASCP Board of Certification, via Pearson VUE
- Recertification: Every 3 years through the Credential Maintenance Program (CMP)
What’s on the ASCP MLS cheat sheet
- Blood Banking (17–22%) — ABO/Rh and other blood groups, antibody screen and panel, the DAT and IAT, compatibility and crossmatch, transfusion reactions, and HDFN.
- Chemistry (17–22%) — carbohydrates, lipids and proteins, enzymes and cardiac markers, electrolytes and acid-base, endocrine, TDM, and toxicology.
- Hematology (17–22%) — red cell indices and anemias, white cells and leukemias, hemostasis and coagulation (PT/INR, aPTT), and blood-smear morphology.
- Microbiology (17–22%) — specimen setup and Gram stain, Gram-positive and Gram-negative ID, susceptibility testing, and myco/viro/para/mycology.
- Urinalysis & Body Fluids (5–10%) — physical and chemical strip testing, microscopic sediment and casts, plus CSF and other body-fluid analysis.
- Immunology (5–10%) — immunoglobulins, Gell and Coombs hypersensitivity, autoimmunity, and serologic testing such as ANA.
- Laboratory Operations (5–10%) — quality control with Levey-Jennings and Westgard rules, proficiency testing, CLIA, lab math, and instrumentation.
How to use it in your final week
- Front-load the big four — Blood Banking, Chemistry, Hematology, and Microbiology are each 17–22% of the exam, roughly three-quarters of every question, so give them most of your review passes.
- Drill the reflex facts until they're automatic — O negative is the universal red cell donor, DAT detects in vivo coating while IAT detects in vitro sensitization, and an acute hemolytic reaction means an ABO/ID error.
- Practice correlating results to disease, not just recalling them — muddy-brown casts point to acute tubular necrosis, RBC casts to glomerulonephritis, and low CSF glucose with neutrophils to bacterial meningitis.
- Pair each review pass with a short timed practice set so the 2-hour-30-minute clock and no-skip computer-adaptive format feel routine before test day.
The cheat sheet is your review layer — your ASCP MLS practice test drives the exam-readiness ring at the top of this page. Download it, review, then take a full practice exam (or drill with the study guide and flashcards) to see where you stand.
ASCP MLS cheat sheet FAQ
Yes — the ASCP MLS cheat sheet is 100% free to download as a PDF, with no sign-up required. It's part of Career Employer's free Medical Laboratory Scientist toolkit alongside the practice test, study guide, and flashcards.
It condenses the highest-yield facts from all seven ASCP Board of Certification content areas into a fast reference: blood banking (ABO/Rh, antiglobulin tests, transfusion reactions), chemistry, hematology, microbiology, plus urinalysis and body fluids, immunology, and laboratory operations — organized by the exam's content weights.
It's built from the current ASCP BOC Medical Laboratory Scientist Examination Content Guideline, and we review it against the official ASCP outline regularly so the weighted content areas match what the computer-adaptive exam tests.
No — the cheat sheet is a review and last-week cram aid, not a substitute for full-length practice. The MLS is a 100-item computer-adaptive exam scored 100–999 with a passing standard of 400, so use the sheet to lock in facts and the practice test to build steady accuracy across the four heavy disciplines.
Click the download button (or the preview card) at the top of this page to open the PDF instantly. Bookmark this page so you can find it again in your final week before test day.
References
- 1.ASCP Board of Certification. “Medical Laboratory Scientist, MLS(ASCP) and MLS(ASCPi) Examination Content Guideline.” ascp.org, 2026. ↑
- 2.ASCP Board of Certification. “About the Examination — Computer Adaptive Testing & Scaled Scoring.” ascp.org, 2026. ↑
- 3.ASCP Board of Certification. “Credential Maintenance Program (CMP).” ascp.org, 2026. ↑
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