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The prothrombin time (PT) test and partial thromboplastin time (PTT) measure how quickly blood clots. The tests can help detect bleeding disorders, check a person’s response to blood thinners, and assess a person’s risk for bleeding prior to surgery.
A prothrombin time (PT) test measures how many seconds it takes for a clot to form in a blood sample. Since the results of this test can vary with different labs or test methods, your results may be used to create an INR (international normalized ratio).
A PT/INR test measures how well you’re responding to warfarin (Coumadin) or another blood thinner. If your level is too low, you may need to increase your medication dose. If your level is too high, you may need to lower your medication dose.
What is a prothrombin time (PT/INR) test? A prothrombin time (PT or PT/INR) test measures how quickly your blood clots. The results may be in seconds or, more commonly, a calculation called the International Normalized Ratio (INR).
The prothrombin time, sometimes referred to as PT or pro time, test is a test to evaluate blood clotting. Prothrombin is a protein produced by your liver. It is one of many factors in your blood that help it to clot appropriately.
A prothrombin time test tells you how long it takes your blood to clot. Learn what it looks for, when you might need one, and what the results mean.
PT results often are reported as an international normalized ratio (INR) that’s expressed as a number. A typical range for a person not taking blood thinner medication is 0.9 to about 1.1.
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.
PT is measured in seconds. Most of the time, results are also given as what is called INR (international normalized ratio). If you are not taking blood thinning medicines, such as warfarin, the normal range for your results is: PT of 11 to 13.5 seconds; INR of 0.8 to 1.1
An increased Prothrombin time or INR means that your blood is taking longer to form a clot. If you are not taking anticoagulant drugs and your PT is prolonged, additional testing may be necessary to determine the cause.