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Exam Review

Key Facts: ASCP H Exam

100

Exam Questions

ASCP BOC H exam page

2.5 hrs

Exam Time

ASCP BOC H exam page

400

Minimum Passing Score

ASCP 100-999 scoring scale

$240

Application Fee

ASCP BOC H exam page

ASCP BOC lists the H exam as 100 multiple-choice questions in 2.5 hours with scores reported on a 100-999 scale and 400 as the minimum passing score. The current H application fee is $240. Candidates must meet specific eligibility routes including education and clinical hematology experience.

Sample ASCP H Practice Questions

Try these sample questions to review concepts for the ASCP H exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 122+ question experience with AI tutoring.

1What is the normal range for a white blood cell (WBC) count in adults?
A.1,000-3,000/mcL
B.4,500-11,000/mcL
C.15,000-25,000/mcL
D.50,000-100,000/mcL
Explanation: The normal adult WBC count is 4,500-11,000/mcL. Leukocytosis (elevated WBC) can indicate infection, inflammation, or malignancy. Leukopenia (decreased WBC) may result from bone marrow suppression, viral infections, or autoimmune conditions. The WBC differential provides additional diagnostic information.
2Which RBC index measures the average size of red blood cells?
A.MCH
B.MCHC
C.MCV (mean corpuscular volume)
D.RDW
Explanation: MCV (mean corpuscular volume) measures the average size of red blood cells in femtoliters (fL). Normal range is 80-100 fL. Microcytic (low MCV) anemias include iron deficiency and thalassemia. Macrocytic (high MCV) anemias include vitamin B12/folate deficiency and MDS. MCV is calculated as (Hct/RBC count) x 10.
3What does an elevated RDW (red cell distribution width) indicate?
A.Uniform RBC size
B.Increased variation in RBC size (anisocytosis)
C.Normal hemoglobin
D.High platelet count
Explanation: RDW measures the degree of variation in red blood cell size (anisocytosis). An elevated RDW indicates mixed populations of small and large RBCs. Iron deficiency anemia characteristically shows elevated RDW (mixed normocytic and microcytic cells), while thalassemia trait typically shows normal RDW (uniformly microcytic). RDW helps differentiate these two common microcytic anemias.
4Which cell appears as a large, bilobed nucleus with bright pink cytoplasmic granules on a peripheral blood smear?
A.Neutrophil
B.Eosinophil
C.Basophil
D.Monocyte
Explanation: Eosinophils have a characteristic bilobed nucleus (eyeglasses shape) with large, uniform, bright orange-pink cytoplasmic granules. They are associated with allergic reactions, parasitic infections, and certain malignancies. Normal eosinophil count is 1-4% of the WBC differential.
5What RBC morphology is characterized by target-shaped cells with a central area of hemoglobin surrounded by a pale ring?
A.Spherocytes
B.Target cells (codocytes)
C.Schistocytes
D.Sickle cells
Explanation: Target cells (codocytes) have a bull's-eye appearance with hemoglobin concentrated in the center and periphery, separated by a pale ring. They are seen in liver disease, thalassemia, hemoglobin C disease, iron deficiency, and post-splenectomy. The increased membrane-to-volume ratio creates the target appearance.
6What is the normal prothrombin time (PT) range?
A.5-8 seconds
B.10-14 seconds
C.25-35 seconds
D.45-60 seconds
Explanation: The normal PT range is approximately 10-14 seconds (varies by reagent/instrument). PT measures the extrinsic and common coagulation pathways (factors VII, X, V, II, fibrinogen). It is used to monitor warfarin therapy and evaluate liver function. The INR (International Normalized Ratio) standardizes PT results across laboratories.
7An aPTT mixing study corrects to normal. What does this indicate?
A.The presence of an inhibitor (e.g., lupus anticoagulant)
B.A factor deficiency that is corrected by the normal plasma in the mix
C.The patient is on heparin therapy
D.The test is invalid
Explanation: An aPTT mixing study that corrects to normal indicates a factor deficiency, because the normal plasma provides the missing factor(s). If the mixing study does not correct (remains prolonged), an inhibitor such as lupus anticoagulant or a specific factor inhibitor is present. Mixing studies are essential for differentiating deficiencies from inhibitors when the aPTT is prolonged.
8What is the characteristic peripheral blood smear finding in iron deficiency anemia?
A.Macrocytic, hyperchromic cells
B.Microcytic, hypochromic cells with increased RDW
C.Normocytic, normochromic cells
D.Schistocytes and helmet cells
Explanation: Iron deficiency anemia shows microcytic (low MCV), hypochromic (low MCHC) red blood cells with increased RDW (anisocytosis). Additional findings may include target cells, pencil cells (elliptocytes), and thrombocytosis. The elevated RDW distinguishes iron deficiency from thalassemia trait, which typically shows uniform microcytosis with normal RDW.
9What does a left shift in the WBC differential indicate?
A.Increased mature neutrophils
B.Increased immature granulocytes (bands, metamyelocytes, myelocytes) in peripheral blood, suggesting active infection or inflammation
C.Increased lymphocytes
D.Decreased eosinophils
Explanation: A left shift refers to increased immature granulocyte forms (bands, metamyelocytes, myelocytes) in peripheral blood. It indicates bone marrow stimulation from acute bacterial infection, inflammation, or stress response. The bone marrow releases immature cells to meet increased demand. A band count greater than 10% is considered a significant left shift.
10Which hemoglobin variant causes sickle cell disease?
A.Hemoglobin C
B.Hemoglobin S
C.Hemoglobin E
D.Hemoglobin F
Explanation: Hemoglobin S (HbS) is caused by a point mutation substituting valine for glutamic acid at position 6 of the beta-globin chain. Homozygous HbSS causes sickle cell disease with chronic hemolytic anemia, vaso-occlusive crises, and organ damage. HbS polymerizes under deoxygenation, causing RBCs to sickle. Hemoglobin electrophoresis or HPLC identifies the variant.

About the ASCP H Exam

The ASCP H exam certifies hematology technologists in cell morphology, coagulation testing, hemoglobin disorders, leukemia classification, bone marrow evaluation, flow cytometry, and hemostasis. This specialty credential validates advanced hematology bench competency beyond general MLS certification.

Exam sponsor: ASCP BOC / Pearson VUE. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

100 multiple-choice questions

Time Limit

2.5 hours

Passing Score

Scaled score 400 (100-999 scale)

Exam / Certification Fees

$240

Exam sponsor website

Reported exam pass rate: Not publicly disclosed. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25-30%

Cell Morphology & Hematology

Peripheral blood smear evaluation, RBC/WBC morphology, CBC interpretation, and normal vs abnormal cell identification

20-25%

Coagulation & Hemostasis

PT, aPTT, fibrinogen, D-dimer, mixing studies, factor assays, platelet function, and anticoagulant monitoring

15-20%

Hemoglobin Disorders & Anemias

Hemoglobin electrophoresis, thalassemias, sickle cell disease, iron studies, and classification of anemias

15-20%

Leukemia Classification & Bone Marrow

WHO classification of leukemias and lymphomas, bone marrow differential, cytochemical stains, and MDS

10-15%

Flow Cytometry & Special Testing

Immunophenotyping panels, CD markers, body fluid analysis, quality control, and instrumentation

Preparing for the ASCP H Exam

What You Need to Know

  • Passing score: Scaled score 400 (100-999 scale)
  • Assessment: 100 multiple-choice questions
  • Time limit: 2.5 hours
  • Exam / certification fees: $240 Official sources

Using Our Practice Resources

  • Work through all 122 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

ASCP H: Suggested Study Strategy

1Master peripheral blood smear morphology by reviewing image-based cases for RBC, WBC, and platelet abnormalities
2Build coagulation cascade flowcharts and practice interpreting mixing studies for factor deficiencies vs inhibitors
3Study WHO classification of acute leukemias, MDS, and lymphomas with associated immunophenotyping panels
4Review hemoglobin electrophoresis patterns for sickle cell disease, thalassemias, and hemoglobin variants
5Practice calculating RBC indices and correlating them with iron studies for anemia classification
6Know flow cytometry CD marker panels for B-cell, T-cell, and myeloid lineage determination
7Review bone marrow differential counting and blast identification criteria

Frequently Asked Questions

How many questions are on the ASCP H exam?

The ASCP H exam consists of 100 multiple-choice questions administered over a 2.5-hour testing period at Pearson VUE test centers.

What score do I need to pass the ASCP H exam?

ASCP reports exam scores on a 100-999 scale. The minimum passing score for the H exam is 400.

What topics are tested on the ASCP H exam?

The H exam covers cell morphology, coagulation and hemostasis, hemoglobin disorders, leukemia classification, bone marrow evaluation, flow cytometry, and hematology instrumentation.

How much does the ASCP H exam cost in 2026?

The current ASCP BOC H application fee is $240 (non-refundable). This fee covers the exam application and one testing attempt.

What is the difference between H(ASCP) and MLS(ASCP)?

H(ASCP) is a specialty credential focused solely on hematology and coagulation, while MLS(ASCP) is a generalist certification covering all laboratory disciplines. The H credential demonstrates deeper hematology expertise.

How should I study for the ASCP H exam?

Prioritize peripheral blood smear interpretation and coagulation cascade understanding. Practice identifying abnormal cell morphology, interpreting coagulation workups, and classifying anemias and leukemias using WHO criteria.