Prothrombin Time (INR)
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The prothrombin time (PT) is a test that helps evaluate your body’s ability to appropriately form blood clots.
Blood.
None needed, however if you are receiving anticoagulant therapy, the blood sample should be collected before taking your daily dose.
A PT measures the number of seconds it takes for a clot to form in your sample of blood after substances (reagents) are added. The PT is often performed along with a partial thromboplastin time (PTT) and together they assess the amount and function of proteins called coagulation factors that are an important part of proper blood clot formation. For people taking warfarin, most laboratories report PT results that have been adjusted to the INR. A prolonged PT means that the blood is taking too long to form a clot, this may be caused by conditions such as liver disease, vitamin K deficiency, or a coagulation factor deficiency (e.g., factor VII deficiency).