Question

which of the following is used to monitor coumadin therapy?
appt
hageman factor
pt

Explanation:

Coumadin (warfarin) affects the extrinsic pathway of coagulation. Prothrombin time (PT) is used to monitor the extrinsic pathway. Activated partial thromboplastin time (APPT) monitors the intrinsic pathway (used for heparin therapy). Hageman factor (Factor XII) is part of the intrinsic pathway activation and not used for routine Coumadin monitoring.

Answer:

C. PT