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INR Calculator
Calculate International Normalized Ratio (INR) from Prothrombin Time
Hematology Guidelines: The International Normalized Ratio (INR) standardizes prothrombin time (PT) testing across laboratories using the International Sensitivity Index (ISI). Formula: $\text{INR} = (\text{Patient PT} / \text{Mean Normal PT})^{\text{ISI}}$. Enter lab parameters below.
Coagulation Lab Parameters Input
Calculation Results
⚠️ Not medical advice. For hematology, laboratory medicine, and clinical reference only. Monitoring of anticoagulant therapy (such as Warfarin / Coumadin) and dosage adjustments must be supervised strictly by a qualified physician.