ASCP Practice Test
Updated for October 2026Welcome to our free ASCP practice tests. Whether you're just starting your exam prep or looking for a final review, our 33 practice tests cover everything you need to know to pass the American Society for Clinical Pathology exam.
Each practice test includes detailed answer explanations to help you understand not just the correct answer, but why other options are wrong. Our questions are regularly updated to reflect the latest exam objectives and format.
Why Use Our ASCP Practice Tests?
- Free and unlimited access — no registration required
- Detailed explanations for every question
- Multiple practice tests covering all exam topics
- Instant scoring so you know where to focus your study
Sample ASCP Practice Questions
Try these questions from our free ASCP practice tests. The correct answer and an explanation follow each question.
The indirect antiglobulin test (IAT or indirect Coombs test) detects:
- A. Antibodies already coating red cells in vivo
- B. Unexpected antibodies in patient serum that react with reagent red cells in vitro
- C. ABO forward grouping
- D. Platelet antibodies
Answer: B. Unexpected antibodies in patient serum that react with reagent red cells in vitro
IAT detects unexpected alloantibodies or autoantibodies in patient serum or plasma by incubating patient serum with reagent red cells, washing to remove unbound antibody, then adding anti-human globulin (AHG) reagent that agglutinates IgG-coated cells.
A positive oxidase test (purple color) differentiates which organism from Enterobacteriaceae?
- A. Staphylococcus aureus
- B. Pseudomonas aeruginosa
- C. Escherichia coli
- D. Enterococcus faecalis
Answer: B. Pseudomonas aeruginosa
Pseudomonas aeruginosa is oxidase-positive (contains cytochrome c oxidase), while all Enterobacteriaceae are oxidase-negative.
Which test is used to confirm the diagnosis of polycythemia vera by measuring the total red cell mass?
- A. ESR
- B. Hematocrit
- C. Chromium-51 RBC mass study
- D. Reticulocyte count
Answer: C. Chromium-51 RBC mass study
The chromium-51 RBC mass study directly measures total red cell volume to confirm true polycythemia.
The direct antiglobulin test (DAT) detects:
- A. Free antibody in serum
- B. Antibody or complement bound to patient's RBCs in vivo
- C. ABO incompatibility in vitro
- D. Platelet antibodies
Answer: B. Antibody or complement bound to patient's RBCs in vivo
The DAT uses antihuman globulin to detect IgG or complement already coating the patient's red blood cells.
ASCP Questions and Answers
About the Author
Registered Nurse & Healthcare Educator
Johns Hopkins University School of NursingDr. Sarah Mitchell is a board-certified registered nurse with over 15 years of clinical and academic experience. She completed her PhD in Nursing Science at Johns Hopkins University and has taught NCLEX preparation and clinical skills courses for nursing students across the United States. Her research focuses on evidence-based exam preparation strategies for healthcare certification candidates.