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Send to: is required Error: This is required Error: Not a valid value. On this page What is being tested? Why would I need this test? How to prepare for this test Understanding your results More information Related information on Australian websites What is being tested?
Your doctor can use an INR test to make sure the warfarin dose is right for you. This test can also be used to: check for bleeding conditions check for blood clotting problems, especially before surgery check how well your liver is working How to prepare for this test No special preparation is needed. Understanding your results When you are having warfarin treatment, your doctor will probably have a target INR for you.
About blood testing Visit our Guide to blood testing to learn more about blood tests in general with information such as: what to consider before having the test what happens during a blood test results accuracy blood tests cost. Back To Top. General search results. Long-term treatment with warfarin is recommended for patients with atrial fibrillation at risk.
Will I need to do anything to prepare for the test? Are there any risks to the test? What do the results mean? If you are taking warfarin: INR levels that are too low may mean you are at risk for dangerous blood clots. INR levels that are too high may mean you are at risk for dangerous bleeding.
Your health care provider will probably change your dose of warfarin to reduce these risks. If you are not taking warfarin and your INR or prothrombin time results were not normal, it may mean one of the following conditions: A bleeding disorder, a condition in which the body can't clot blood properly, causing excessive bleeding A clotting disorder, a condition in which the body forms excessive clots in arteries or veins Liver disease Vitamin K deficiency.
Vitamin K plays an important role in blood clotting. References American Society of Hematology [Internet]. Washington D. Blood Clots; [cited Jan 30]; [about 3 screens]. Excessive Clotting Disorders; [updated Oct 29; cited Jan 30]; [about 2 screens]. Mayo Foundation for Medical Education and Research; c— Prothrombin time test: Overview; Nov 6 [cited Jan 30]; [about 3 screens].
This measures the time it takes for your blood to clot. You may need this test if you take medicines, such as warfarin, that change the way your blood clots. Anti-clotting medicines are helpful if you are at risk for a stroke.
But if you're in an accident and your blood doesn't clot quickly, you may be at risk of dangerous bleeding. Your healthcare provider uses the INR to know whether your anti-clotting medicines are at the right dose or if you need to change the dose. Newer anti-clotting medicines don't need INR monitoring and dose changes like warfarin does, so this lab test may not be used for those medicines. You may also need this test to help your healthcare provider diagnose and manage certain health problems, such as liver disease and bleeding disorders.
Your healthcare provider will order the PT test first, so that the results can be used to calculate the INR. In a PT test, chemicals are added to your blood sample, and the lab measures the time in seconds that it takes to clot.
Your provider may also order these tests if he or she is concerned about your liver function or risk of bleeding:. Test results may vary depending on your age, gender, health history, the method used for the test, and other things. Sometimes your doctor may refer you to a specialized clinic called an anticoagulation management service. The medical staff in these clinics will check your INR and help make adjustments to your warfarin dose if needed.
Make a donation. Twitter Facebook YouTube. Friend's Email Address. Your Name. Your Email Address. Send Email. Donate today. Updated November After being diagnosed with a blood clot thrombosis , your healthcare provider may prescribe warfarin for treatment.
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