Medical Emergencies · single question
For a patient with hemophilia (factor VIII/IX deficiency), which laboratory test is most relevant?
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Correct answer: B. Partial thromboplastin time (PTT)
- A. PT/INR assesses the extrinsic pathway (and warfarin), not the intrinsic factors deficient in hemophilia.
- B. Correct. Hemophilia affects the intrinsic pathway (factors VIII/IX), prolonging the PTT.
- C. Bleeding time evaluates platelet function, which is normal in hemophilia.
- D. Platelet count is normal in hemophilia (a coagulation, not platelet, disorder).
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