![]() ![]() A number lower than that range means blood clots more quickly than normal. A number higher than that range means it takes blood longer than usual to clot. The average time range for blood to clot is about 10 to 13 seconds. Prothrombin time test results can be presented in two ways. Home testing kits are available for people who have to take blood thinners for long periods and who have been trained in taking blood samples and testing them. You may receive the test result within minutes, while you are still in the exam room. In some clinics, a nurse will take a sample of your blood with a finger stick. If your provider sends your blood to an off-site laboratory, it may take several days to receive the results. If the laboratory analysis is done on-site, you could have your test results within hours. Your blood might be sent to a laboratory for analysis. Obtaining the blood sample for prothrombin time testing usually takes just a few minutes, like any other blood test. You might experience soreness or minor bruising at the site in the arm where your blood is drawn. A longer-than-normal PT can be caused by treatment with blood-thinning medicines, such as warfarin or, in rare cases, heparin.A prothrombin time test is similar to any other blood test.This is a life-threatening condition in which your body uses up its clotting factors so quickly that the blood cannot clot and bleeding does not stop. A longer-than-normal PT can also mean that you have disseminated intravascular coagulation (DIC). It can also mean a lack of vitamin K liver disease, such as cirrhosis or that a liver injury has occurred. A longer-than-normal PT can mean a lack of or low level of one or more blood clotting factors (factors I, II, V, VII, or X).Prothrombin times are also kept at longer times for people with artificial heart valves, because these valves have a high chance of causing clots to form. The warfarin dose is changed so that the prothrombin time is longer than normal (by about 1.5 to 2.5 times the normal value or INR values 2 to 3). In some labs, only the INR is reported and the PT is not reported. Using the INR system, treatment with warfarin (Coumadin) will be the same. A value that isn't in the normal range may still be normal for you.Ī method of standardizing prothrombin time results, called the international normalized ratio (INR) system, has been developed so the results among labs using different test methods can be understood in the same way. Your doctor will also look at your results based on your age, health, and other factors. Your lab report should show the range that your lab uses for each test. An increase in the use of the clotting factors.Īn abnormal prothrombin time is often caused by liver disease or injury or by treatment with blood thinners.Įach lab has a different range for what's normal.Other substances, called inhibitors, that affect the clotting factors.The absence of any of the clotting factors.A change in the activity of any of the clotting factors.Blood-thinning medicine, such as warfarin. ![]() Prothrombin time is an important test because it checks to see if five different blood clotting factors (factors I, II, V, VII, and X) are present. Vitamin K is needed to make prothrombin and other clotting factors. Prothrombin, or factor II, is one of the clotting factors made by the liver. In some labs, only the INR is reported and the PT is not reported.īlood clotting factors are needed for blood to clot (coagulation). It lets your doctor understand results in the same way even when they come from different labs and different test methods. INR (international normalized ratio) stands for a way of standardizing the results of prothrombin time tests, no matter the testing method. PT is also used to check whether medicine to prevent blood clots is working.Ī PT test may also be called an INR test. A prothrombin time test can be used to check for bleeding problems. Prothrombin time (PT) is a blood test that measures how long it takes blood to clot. ![]()
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