Platelets and Clotting Disorders · Physiology

Hemophilia A is caused by deficiency of which clotting factor?

  1. Factor VIII
  2. Christmas factor IX
  3. Plasma factor XI precursor
  4. Hageman factor XII
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Correct answer: Factor VIII

Hemophilia A results from deficiency of factor VIII. It leads to prolonged bleeding and is inherited as an X-linked disorder.

Difficulty: Medium Question 9 of 20

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