Which of the following tests can be used to monitor coumadin therapy?

Question

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PT-INR (prothrombin time international normalized ratio) is the main test used to monitor coumadin therapy. It measures how long it takes for the blood to clot and is monitored to ensure that the patient's blood is in the appropriate range for preventing blood clots. Factor assays are used to identify deficiencies in specific clotting factors, APTT (activated partial thromboplastin time) is used to monitor heparin therapy, and reptilase time measures fibrinogen levels and is not commonly used for monitoring coumadin therapy.

Which of the Following Tests Can Be Used to Monitor