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The International Normalized Ratio (INR) standardizes prothrombin time results across laboratories. It measures your extrinsic clotting pathway efficiency, primarily reflecting vitamin K-dependent factor activity. INR is the standard test for monitoring warfarin therapy and evaluating liver synthetic function.
Also known as: INR, International Normalized Ratio, Prothrombin Time INR, PT/INR, 组织因子诱导型凝血过程.INR
High INR means slower clotting from warfarin, vitamin K deficiency, or liver disease. Low INR indicates faster clotting or warfarin resistance.
Normal INR is 0.9-1.1. Warfarin therapy targets 2.0-3.0 for atrial fibrillation. An INR above 4.0 significantly increases bleeding risk.