Medical Emergencies · single question
Which laboratory test is used to evaluate Hemophilia A?
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Correct answer: A. Partial thromboplastin time (PTT)
- A. Correct. Hemophilia A is a factor VIII deficiency in the intrinsic pathway, which prolongs the PTT (aPTT).
- B. PT assesses the extrinsic pathway (factor VII), normal in hemophilia A.
- C. Bleeding time evaluates platelet function/vessel interaction, not factor VIII.
- D. Platelet count is normal in hemophilia A.
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