Which of the following tests is used to assess platelet function in vivo?
A) Prothrombin time
B) Activated partial thromboplastin time
C) Bleeding time
D) Platelet aggregation studies

Question

Quizplus · Accepted Answer

Bleeding time is the only test listed that specifically assesses platelet function in vivo (in the living body). Prothrombin time and activated partial thromboplastin time are laboratory tests that evaluate coagulation factors, not platelet function. Platelet aggregation studies are in vitro tests that involve adding platelet agonists to a blood sample to see how well the platelets clump together, but this does not necessarily reflect platelet function in vivo.

Which of the Following Tests Is Used to Assess Platelet