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About the test
What is this test done for?
Prothrombin time is a blood test to measure the time that the plasma (liquid portion of the blood) takes to clot.
Why is it Done?
The test is done to diagnose bleeding disorders like haemophilia.
When should it be performed?
  • It is performed to find the cause for abnormal bleeding or bruising. -
  • If a person is on blood-thinning medication like heparin, warfarin, then to assess and monitor the correct dose.
  • As a screening testing before certain surgeries to assess the bleeding time and clotting time.
  • to assess the normal functioning of the liver.
How is it done
Certain medications like aspirin, heparin, antihistamines and vitamin C supplements can affect the test, hence these medications need to be monitored according before the test. A blood sample will be collected from a vein in your name.fasting is not necessary prior to sample collection.
  • The normal values, if a person is not on warfarin medications are 11 to 13.5 seconds. INR (International normalized ratio) is 0.8 to 1.1. If the person is on warfarin, then the normal values are INR 2.0 to 3.0. Drinking lot of alcohol or eating Vitamin K rich foods like broccoli, soybean products can alter the readings.
  • A prolonged test beyond the normal time range could mean that one is suffering from bleeding disorders, liver diseases, or a low level of Vitamin K.
  • If on medication, the results are not as expected, it could mean that the dose of medication is inadequate and the dose needs to be increased.
Other Tests
Aspartate Aminotransferase (AST) and Alanine Aminotransferase (ALT) could be performed to diagnose liver abnormalities.
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