• Test Code - PL0098
  • Test Name - P. Time with INR
  • Views - 154 Views
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Test Details & Preparation


  • A prothrombin time (PT) is a test used to help detect and diagnose a bleeding disorder or excessive clotting disorder the international normalized ratio (INR) is calculated from a PT result and is used to monitor how well the blood-thinning medication (anticoagulant) Warfarin (Coumadin®) is working to prevent blood clots.

  • A prothrombin time (PT) test is done when you are taking Warfarin or when you have unexplained or prolonged bleeding or inappropriate blood clotting.

  • A blood sample drawn from a vein in your arm sometimes blood from a finger-stick for a prothrombin time (PT) test.

  • No test preparation is required for a prothrombin time (PT) test, although if you are receiving anticoagulant therapy, the specimen should be collected before taking your daily dose.

  • The test result for a PT depends on the method used, with results measured in seconds and compared to the normal range established and maintained by the laboratory that performs the test. This normal range represents an average value of healthy people who live in that area and will vary somewhat from lab to lab.

  • Someone who is not taking Warfarin would compare their PT test result to the normal range provided with the test result by the laboratory performing the test.

  • 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.


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