ASCP BOC Specialist in Hematology (SH) Examination Practice Test
Specialist hematology practice connects blood-cell morphology, hemostasis testing, and hematologic disease mechanisms with interpretation of laboratory findings. Questions in this bank sample topics including hemolytic disorders, iron and vitamin deficiencies, leukemia immunophenotyping and cytogenetics, coagulation abnormalities, and flow-cytometric patterns.
Exam overview
About the ASCP BOC Specialist in Hematology (SH) Examination Exam
Hematology specialists interpret complete blood counts, peripheral blood films, and specialized assays to distinguish related disorders and identify findings that require further investigation. This work includes recognizing patterns such as schistocytes or hypersegmented neutrophils, relating cell morphology to hemolysis or nutrient deficiency, and assessing whether coagulation results fit a factor deficiency, inhibitor, or other hemostatic abnormality. Immunophenotypic markers and chromosome-level findings help classify hematologic neoplasms, while flow cytometry can characterize abnormal cell populations. Strong interpretation also accounts for test limitations: an isolated prolonged clotting time, for example, must be evaluated alongside clinical history and other laboratory results rather than treated as a diagnosis by itself.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
Which flow-cytometric pattern is characteristic of paroxysmal nocturnal hemoglobinuria?
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Correct answer: AParoxysmal nocturnal hemoglobinuria arises from an acquired PIGA mutation that impairs glycosylphosphatidylinositol anchor formation. As a result, affected blood cells lack GPI-anchored proteins, including CD55 and CD59; flow cytometry commonly assesses this deficiency.
Which laboratory method is commonly used to quantify fetal hemoglobin in red cells by distinguishing cells with high HbF content?
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Correct answer: AIn the Kleihauer–Betke method, adult hemoglobin is eluted from red cells by acid treatment, while HbF-containing cells retain hemoglobin and can be identified and quantified microscopically.
A patient has thrombocytopenia, schistocytes, elevated LDH, and normal coagulation screening tests. Which general mechanism best explains the red cell fragmentation?
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Correct answer: ASchistocytes result from mechanical fragmentation as red cells pass through abnormal or obstructed small vessels. This pattern can occur in thrombotic microangiopathies, which often feature thrombocytopenia and hemolysis while routine coagulation tests may remain near normal.
A patient has a markedly prolonged thrombin time. Which abnormality can directly account for this result?
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Correct answer: AThrombin time evaluates conversion of fibrinogen to fibrin after thrombin is added. Low fibrinogen, dysfunctional fibrinogen, or interference with thrombin activity can prolong it; isolated factor VII or VIII deficiency does not directly affect this step.
A patient has a prolonged activated partial thromboplastin time and a history of recurrent deep-vein thrombosis. Factor VIII, IX, and XI activities are within reference intervals. Which property of factor XII deficiency is relevant when interpreting this laboratory pattern?
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Correct answer: BFactor XII participates in contact activation in vitro, so its deficiency can markedly prolong the activated partial thromboplastin time. Unlike deficiencies of many other coagulation factors, factor XII deficiency generally does not produce a clinical bleeding disorder.
Which chromosome-level abnormality is classically associated with acute myeloid leukemia with RUNX1::RUNX1T1 fusion?
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Correct answer: AThe t(8;21) rearrangement produces the RUNX1::RUNX1T1 fusion and is associated with a genetically defined subtype of acute myeloid leukemia.
Which laboratory finding is most characteristic of iron deficiency before anemia develops?
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Correct answer: BDepleted iron stores are reflected by a decreased serum ferritin, which can precede a fall in hemoglobin or development of microcytosis. Ferritin can be increased by inflammation, so results should be interpreted in clinical context.
How to use this practice test
The free practice session draws up to 20 random questions from the 50-question bank. Use each question to practice connecting laboratory patterns with likely mechanisms, differential diagnoses, and appropriate interpretation. Results appear after the session so you can identify which concepts to revisit.
Preparation tips
- Compare red-cell morphology with likely mechanisms: distinguish schistocyte-associated fragmentation from spherocytosis and relate macro-ovalocytes or hypersegmented neutrophils to megaloblastic patterns.
- For coagulation cases, interpret PT, aPTT, and thrombin time alongside factor activities and clinical history; distinguish bleeding-associated deficiencies from abnormalities that may be linked to thrombosis.
- Review lineage-defining immunophenotypic markers and connect characteristic leukemia fusions with their corresponding chromosome abnormalities.
- Contrast methods used to assess fetal hemoglobin and iron status, including what each method measures and how an abnormal result fits the clinical pattern.
- For flow-cytometry questions, focus on how the marker pattern supports a diagnosis such as paroxysmal nocturnal hemoglobinuria, rather than memorizing isolated marker names.