Hematology - Clinical Scientist - DHA Healthcare Professional Licensing

• Special Hematology

  Advanced hematological disorders, abnormal cell populations, inherited and acquired hematologic conditions, and complex diagnostic interpretation.

• Hematology Analyzer / Automation & Peripheral Blood Film

  Automated hematology analyzers, flag interpretation, delta checks, peripheral blood film correlation, and analyzer troubleshooting.

• Coagulation

  Intrinsic and extrinsic pathways, coagulation factor deficiencies, inhibitors, anticoagulant monitoring, and special coagulation assays.

• Quality Control

  Internal quality control, Levey–Jennings charts, Westgard rules, method validation, and error investigation in hematology laboratories.

• Blood Banking

  Blood grouping, antibody screening, compatibility testing, transfusion reactions, and blood component storage.

• Transfusion Medicine

  Massive transfusion protocols, hemovigilance, adverse reaction management, and regulatory requirements.

• Manual Procedures (Cell Counts)

  Manual cell counting techniques, hemocytometer usage, body fluid cell counts, and correlation with automated results.

• Lab Safety

  Biosafety levels, hazard management, waste disposal, and laboratory safety compliance.

• Special Stains and Films

  Cytochemical stains, peripheral smear preparation, stain interpretation, and diagnostic relevance.

• Ethics

  Professional conduct, confidentiality, ethical decision-making, and DHA regulatory standards.Ethics

• Body Fluids

  CSF, synovial, pleural, and ascitic fluid analysis, interpretation, and clinical correlation.

• Special Hematology262 questions
• Analyzers and Blood Films220 questions
• Coagulation159 questions

1. Question 1

   A prolonged APTT that does not correct on mixing study is most suggestive of:

   1. AFactor VIII deficiency
   2. BLupus anticoagulant
   3. CVon Willebrand disease
   4. DHeparin contamination
   Show answer

   Answer: B. Lupus anticoagulant

   Failure to correct on mixing indicates the presence of an inhibitor, most commonly lupus anticoagulant.

2. Question 2

   Which parameter is most sensitive for monitoring internal quality control trends in hematology analyzers?

   1. AMean
   2. BStandard deviation
   3. CCoefficient of variation
   4. DReference range
   Show answer

   Answer: C. Coefficient of variation

   The coefficient of variation (CV) is the most sensitive indicator of analytical precision in quality control monitoring.

3. Question 3

   A CBC shows 15% LUCs. Upon manual review, you see large cells with abundant grey cytoplasm and vacuoles. These are:

   1. AReactive Lymphocytes
   2. BMonocytes
   3. CBlasts
   4. DNeutrophils
   Show answer

   Answer: B. Monocytes

   LUCs often represent monocytes or blasts. Large size and low peroxidase cause flagging. Manual review clarifies identity.

4. Question 4

   A patient has a PT of 13.0s (Normal: 11-14s) and an APTT of 65.0s (Normal: 25-35s). A 1:1 mix with normal plasma corrects the APTT to 32s. Which factor is likely deficient?

   1. AFactor VII
   2. BFactor VIII
   3. CFactor X
   4. DFactor II
   Show answer

   Answer: B. Factor VIII

   A prolonged APTT with normal PT localizes the defect to the intrinsic pathway. Correction after a 1:1 mixing study indicates a factor deficiency rather than an inhibitor. Possible deficient factors include VIII, IX, XI, or XII. Factor assays are required to identify the specific deficiency.

5. Question 5

   A patient with "Warm Autoimmune Hemolytic Anemia" (WAIHA) will typically show which result on the DAT?

   1. APositive C3d only
   2. BPositive IgG only
   3. CPositive IgG and/or C3d
   4. DNegative
   Show answer

   Answer: C. Positive IgG and/or C3d

   Warm autoimmune hemolytic anemia is typically IgG-mediated. DAT is positive for IgG, sometimes with complement. Hemolysis is primarily extravascular via splenic macrophages.

6. Question 6

   What is the "Corrected Reticulocyte Count" for a patient with a Retic of 5.0% and a Hct of 15% (Normal Hct = 45%)?

   1. A0.016
   2. B0.025
   3. C0.15
   4. D0.01
   Show answer

   Answer: A. 0.016

   The corrected reticulocyte count accounts for reduced hematocrit in anemia. It provides a more accurate assessment of marrow response. Without correction, reticulocyte percentage can be misleadingly elevated.

7. Question 7

   In "FISH" (Fluorescence In Situ Hybridization), what is being detected?

   1. AProteins
   2. BSpecific DNA sequences on chromosomes
   3. CCell size
   4. DHemoglobin types
   Show answer

   Answer: B. Specific DNA sequences on chromosomes

   FISH detects specific DNA sequences using fluorescent probes. It identifies translocations, deletions, and amplifications. It is used in cancer diagnostics.

8. Question 8

   What is the "Shelf Life" of a unit of CPDA-1 Whole Blood?

   1. A21 days
   2. B35 days
   3. C42 days
   4. D1 year
   Show answer

   Answer: B. 35 days

   CPDA-1 preserves ATP and red cell viability. Whole blood stored in CPDA-1 can be kept for up to 35 days at 1–6°C. This extended shelf life supports blood inventory management.

9. Question 9

   Which finding on a CSF smear suggests a "Meningeal Leukemia"?

   1. AIncreased Neutrophils
   2. BPresence of Blast cells
   3. CIncreased Glucose
   4. DLow Protein
   Show answer

   Answer: B. Presence of Blast cells

   Any blasts in CSF are abnormal. Their presence confirms CNS involvement by leukemia. This finding has major therapeutic and prognostic implications.

10. Question 10

    A newborn (B-positive) born to an O-positive mother has a weakly positive DAT. What is the most likely antibody?

    1. AAnti-D
    2. BAnti-B
    3. CAnti-Kell
    4. DAnti-C
    Show answer

    Answer: B. Anti-B

    IgG anti-B crosses the placenta from an O-positive mother. It coats fetal B-positive cells. This causes ABO hemolytic disease of the newborn.

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