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A Prothrombin Time (PT) Test is a blood test that measures how long your blood takes to clot. It helps doctors evaluate bleeding disorders, liver function, vitamin K deficiency, and monitor blood-thinning medicines like warfarin
Doctors usually recommend a PT/INR test to monitor anticoagulant therapy, investigate unusual bleeding or bruising, check clotting disorders, or before surgeries and medical procedures.
Fasting is generally not mandatory for a PT test, although overnight fasting may sometimes be preferred. Patients should also inform the doctor about any blood-thinning medicines or supplements they are taking.
The normal Prothrombin Time range is usually around 10–13 seconds, while a normal INR for people not on anticoagulants is typically 0.8–1.2. The target INR may be higher for patients taking blood thinners.
A high PT/INR may indicate liver disease, vitamin K deficiency, clotting disorders, or the effect of anticoagulant medications. It means the blood is taking longer than normal to clot.
The PT test requires a small blood sample, usually collected from a vein in the arm. The sample is then tested in the laboratory to measure clotting time and calculate INR values.
PT test reports are generally available within a few hours, depending on the laboratory and sample processing time. At Dr. B. Lal Lab, results are typically available within 5 hours.
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| Parameter | Normal Range |
| Prothrombin Time (PT) | 10 - 13 seconds |
| International Normalized Ratio (INR) (Not on anticoagulants) | 0.8 - 1.2 |
| International Normalized Ratio (INR) (On anticoagulants) | 2.0 - 3.0 (or higher, as per doctor's advice) |
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