Which of the following laboratory tests is used to diagnose and monitor the treatment of hemophilia A?

A Prothrombin time (PT)
B Activated partial thromboplastin time (aPTT) ✓
C Fibrinogen level
D Bleeding time

Explanation

The activated partial thromboplastin time (aPTT) is used to diagnose and monitor the treatment of hemophilia A, as it measures the activity of factor VIII, which is deficient in this disorder.

Source

Williams Hematology
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Easy MEDICAL Confidence: high