A patient with haemophilia A has prolonged bleeding after a minor procedure. Which clotting factor is deficient?
Correct answer: A. Factor VIII
- A. Factor VIII
- B. Factor II
- C. Factor V
- D. Factor XII
Explanation
Haemophilia A results from deficiency of factor VIII, an intrinsic pathway clotting factor. Factor II is prothrombin, while factors V and XII are associated with other parts of the coagulation pathway.
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Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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