A patient is on Coumadin therapy. Which of the following tests is commonly ordered to monitor the patient's Coumadin levels?

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Prothrombin time (PT) is commonly ordered to monitor Coumadin levels as it measures the patient's ability to clot blood in response to Coumadin therapy. PT measures the time it takes for a clot to form in a sample of blood after a reagent is added. The results are reported as the international normalized ratio (INR), which is a standardized measure of blood clotting time. A therapeutic INR range for Coumadin therapy is typically 2.0-3.0.

A Patient Is on Coumadin Therapy