Washington D.C.: American Society of Hematology c2020. Learn more about laboratory tests, reference ranges, and understanding results. Vitamin K plays an important role in blood clotting. A clotting disorder, a condition in which the body forms excessive clots in arteries or veins.A bleeding disorder, a condition in which the body can't clot blood properly, causing excessive bleeding.If you are not taking warfarin and your INR or prothrombin time results were not normal, it may mean one of the following conditions: Your health care provider will probably change your dose of warfarin to reduce these risks. INR levels that are too high may mean you are at risk for dangerous bleeding.INR levels that are too low may mean you are at risk for dangerous blood clots.If you are not taking warfarin, your results may be in the form of INR levels or the number of seconds it takes for your blood sample to clot (prothrombin time). INR levels are often used because they make it easier to compare results from different labs and different test methods. If you were tested because you are taking warfarin, your results will probably be in the form of INR levels. Your provider will let you know how he or she would like to receive the results. If you are using an at-home test kit, you will need to review your results with your provider.
At-home devices are small and lightweight. Place the instrument or test strip into a device that calculates the results.Collect a drop of blood and place it onto a test strip or other special instrument.Use a small needle to puncture your fingertip.During this test, you or your provider will: If you are taking warfarin, your provider may recommend you test your blood regularly using an at-home PT/INR test kit. This usually takes less than five minutes.Ī fingertip test may be done in a provider's office or in your home. You may feel a little sting when the needle goes in or out. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.
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The test may be done on a blood sample from a vein or a fingertip.Ī health care professional will take a blood sample from a vein in your arm, using a small needle.
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