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. Any duplication or distribution of the information contained herein is strictly prohibited.Prothrombin time (PT) is a blood test that measures how long it takes blood to clot. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. Links to other sites are provided for information only – they do not constitute endorsements of those other sites. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. Your provider will teach you about taking warfarin (Coumadin) the proper way.Ī.D.A.M., Inc. Eating food that changes the way the blood-thinning medicine works in your body. Taking certain over-the-counter (OTC) medicines, vitamins, supplements, cold medicines, antibiotics, or other medicines.INR results lower than 2.0 may put you at risk for developing a blood clot.Ī PT result that is too high or too low in someone who is taking warfarin (Coumadin) may be due to:.INR results higher than 3.0 may put you at even higher risk for bleeding.When your INR is from 2.0 to 3.0, you are more likely to have bleeding problems.Depending on why you are taking the blood thinner, the desired level may be different.If you are taking warfarin to prevent clots, your provider will most likely choose to keep your INR from 2.0 to 3.0: Disorder in which the proteins that control blood clotting become over active ( disseminated intravascular coagulation).Bleeding disorders, a group of conditions in which there is a problem with the body's blood clotting process.If you are not taking blood thinning medicines, such as warfarin, an INR result above 1.1 means your blood is clotting more slowly than normal.
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