Question

Least useful in differentiating hemophilia A from hemophilia B:

A) Factor VIII assay
B) Factor IX assay
C) Platelet count
D) Bleeding time

Answer 1

The least useful test in differentiating hemophilia A from hemophilia B is the platelet count.

Step-by-step explanation:

The least useful test in differentiating hemophilia A from hemophilia B is the platelet count (C). Hemophilia A is characterized by a deficiency of factor VIII, while hemophilia B is characterized by a deficiency of factor IX. The levels of these clotting factors can be measured using factor VIII (A) and factor IX (B) assays. Bleeding time (D) can also be used as a diagnostic tool for hemophilia, as individuals with hemophilia have prolonged bleeding times.