2252. Which of the following is one for a patient on coumarin (warfarin) therapy_______________? September 27, 2025 by Admin A. Partial thromboplastin time ( PTT) B. Prothrombin time (PT) C. Bleeding time (BT) D. Capillary fragility test (CFT) ✅ The correct answer is option B. Prothrombin time (PT).