INR

Coagulation Unit: ratio

Standardized PT; target 2-3 on warfarin

Also known as: International Normalized Ratio,Prothrombin INR

Reference Ranges

Clinical Reference 0.8 – 1.2 ratio

Optimal Range 0.9 – 1.1 ratio

Critical Range > 5.0 ratio

Upload your blood test to see how your INR compares to reference and optimal ranges.