About This Test

The Prothrombin Time (PT) Test, often reported as the International Normalized Ratio (INR), is a crucial blood test that measures how long it takes for your blood to clot. Prothrombin is a protein produced by the liver, playing an essential role in the clotting process. When an injury causes bleeding, a series of complex reactions involving clotting factors, including prothrombin, leads to clot formation to stop the bleeding. The PT test measures the efficiency of this cascade by timing clot formation in a blood sample after adding specific reagents. The INR standardizes these results to provide consistent interpretation across labs globally. This test is vital for monitoring patients on blood-thinning medications such as warfarin, ensuring the medication keeps the blood thin enough to prevent clots but not so thin as to cause excessive bleeding. Abnormal PT/INR values can indicate clotting disorders, vitamin K deficiency, liver disease, or other medical conditions affecting coagulation. Regular PT INR monitoring is essential for safe anticoagulant therapy and managing bleeding risks.

Test Information

Includes (1) Parameter

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