PT/INR Test
Clotting & Anticoagulation
₹350.00
The Prothrombin Time (PT) and International Normalized Ratio (INR) test is a crucial blood test used to assess how long it takes for your blood to clot.
Feature | Details in Short |
What it Measures | The time it takes for a blood sample to clot, specifically evaluating the extrinsic and common pathways of the coagulation cascade (Clotting Factors I, II, V, VII, and X). |
PT (Prothrombin Time) | The actual time, measured in seconds. A longer PT means your blood is clotting more slowly. |
INR (International Normalized Ratio) | A calculation derived from the PT that standardizes the results across different labs and testing methods. It is the preferred value for monitoring. |
Primary Use (Monitoring) | To monitor the effectiveness of the oral anticoagulant (blood thinner) Warfarin (Coumadin). |
Other Uses (Diagnosis) | Diagnosing a bleeding disorder (unexplained bleeding or bruising), checking liver function (most clotting factors are made in the liver), and assessing Vitamin K deficiency. |
Normal Range (Not on Warfarin) | INR: 0.8 to 1.1 (approx.) PT: 11 to 13.5 seconds (approx.) |
Therapeutic Range (On Warfarin) | INR: 2.0 to 3.0 (most common target range, adjusted based on condition). |
Interpretation | High INR: Blood clots too slowly → Increased risk of bleeding. |
Low INR: Blood clots too quickly → Increased risk of dangerous blood clots. |