International Normalized Ratio (INR) details
What International Normalized Ratio (INR) shows
The International Normalized Ratio (INR) is a standardized way of expressing prothrombin time (PT), your blood's clotting speed through one of its main pathways, adjusted using a formula so that results are comparable across different labs and testing methods worldwide. INR is used mainly to monitor and adjust dosing for people taking the blood thinner warfarin, where the goal is usually to keep the INR within a specific target range — high enough to reduce clotting risk, but not so high that bleeding risk becomes dangerous. It's also used more broadly to help evaluate liver function and bleeding disorders, since the liver makes several of the clotting factors this test depends on.
Tests that include International Normalized Ratio (INR)
This test measures prothrombin time to evaluate and monitor coagulation disorders.
- International Normalized Ratio (INR) International Normalized Ratio, a standardized measure of blood clotting time. Mainly used to monitor patients on the blood thinner warfarin.
- Prothrombin Time (PT) Prothrombin Time, a measure of how long it takes your blood to clot via one of its main pathways. Used to evaluate bleeding disorders and liver function, and to monitor warfarin therapy.
This test measures prothrombin time to evaluate and monitor coagulation disorders.
- International Normalized Ratio (INR) International Normalized Ratio, a standardized measure of blood clotting time. Mainly used to monitor patients on the blood thinner warfarin.
- Prothrombin Time (PT) Prothrombin Time, a measure of how long it takes your blood to clot via one of its main pathways. Used to evaluate bleeding disorders and liver function, and to monitor warfarin therapy.
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