1. Glossary
  2. INR (international normalized ratio)

INR (international normalized ratio)

The International Normalized Ratio (INR) is a standardized number that's used to evaluate how your blood clots. It's mostly used for people who are taking blood-thinning medications like warfarin. This measurement helps in controlling dosages and ensuring that the medication is working effectively to prevent blood clots.

The INR is expressed as a ratio and is calculated by comparing your blood clotting time to a normal sample. A higher INR value suggests that your blood takes longer to clot, while a lower value means it clots more quickly. Doctors use this number to monitor and adjust medication to keep your INR within a safe and effective range, decreasing the risk of excessive bleeding or dangerous clots.

This ratio is essential for those with conditions like atrial fibrillation, deep vein thrombosis, or mechanical heart valves, where precise blood thinning is crucial to avoid complications. Regular monitoring of INR ensures that blood thinning therapy remains safe and effective.

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