Also known as Prothrombin Time Blood
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What is this test?

Prothrombin time is a test used to check the amount of time needed for blood to clot. A prothrombin test is used to check any bleeding disorders. This test can also be used to check if the medicines given for blood clotting is working. This test is also called as an international normalized ratio (INR) which is a way of standardizing the results of prothrombin time test. This test is used to diagnose liver disease, vitamin K deficiency, hemophilia, leukemia, bone marrow disorders, problems with the immune system, Von Willebrand disease, and deficiency of clotting factors, etc.

Importance of Prothrombin Time test:

Blood clotting process is called coagulation, which stops bleeding. Clotting factors are needed for coagulation process which is a bunch of proteins. There are 12 clotting factors present in our body. Prothrombin time test is used to check five important clotting factors which are the factor I, II, V, VII, and X are working efficiently. Clotting factors are produced from the liver. Prothrombin is a type of clotting factor which gets converted to thrombin as soon as bleeding occurs. Prothrombin test measures the time taken for the conversion of prothrombin to thrombin to stop bleeding.

Why this test is performed?

This test may be recommended to you if you have a family history of bleeding disorders or if you experience symptoms like nosebleeds, gum bleeds, bleeding more often, bruising frequently, blood in stools, abnormal menstrual bleeding, swollen joints, joint aches, etc. This test is also recommended to you before having surgery. If you are on a blood-thinning medication like warfarin, heparin, enoxaparin, etc this test is recommended regularly to monitor the doses or to see if the therapy is working.


Some medicines may interfere with your test results, that are anticoagulants like heparin, warfarin, antiplatelets like aspirin, clopidogrel, factor Xa inhibitors like rivaroxaban, apixaban, fondaparinux, direct thrombin inhibitors like dabigatran, steroids like prednisolone, cortisone, hormones like estrogens and birth control pills, antacids like pantoprazole, ranitidine, etc. Some foods rich in vitamin K such as broccoli, soy, soybeans, chickpeas, kale, turnip greens, liver, etc make the prothrombin time faster than the normal.

Also known as PT Blood, PT test, Prothrombin Test, Prothrombin Time, International Normalized Ratio, INR.

Test Preparation

Inform your doctor if you are on any medications, have any allergies or underlying medical conditions before your PT. Your doctor will give specific instructions depending on your condition on how to prepare for PT.

No specific preparation is required for prothrombin time test.

Understanding your test results

The normal test results may vary depending on the gender, age, health history, your condition, etc.

Prothrombin time test results are measured in seconds, if your prothrombin time is longer than the normal time, it may indicate you may have a bleeding disorder, liver problems, vitamin K deficiency, inadequate amounts of proteins responsible for a blood clot, etc.

If you get abnormal test results, consult your doctor immediately. Your doctor may recommend other tests depending on your results.

GenderAge groupsValue
MALEAll age groups11 - 14 secs
FEMALEAll age groups11 - 14 secs
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