INR (International Normalized Ratio)
A standardized blood test that measures how slow your blood is clotting on warfarin.
INR is the standardized lab measure of warfarin effect. Most patients on warfarin target an INR of 2.0–3.0; for some indications (mechanical mitral valve), 2.5–3.5.
What this means for you: INR must be in target range before elective surgery; usually <1.5 for major operations. Confirm INR is checked in the days leading up to your procedure.
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