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The International Normalized Ratio (INR) calculator is a simple, free tool to assess the unified prothrombin time (PT), and its meaning. It's an easy way to evaluate both the extrinsic pathway and the common pathway of coagulation .
INR is derived from prothrombin time (PT) which is calculated as a ratio of the patient’s PT to a control PT standardized for the potency of the thromboplastin reagent international sensitivity index (ISI): INR = (PT patient / PT normal) ISI. The variables used can be defined as:
The INR calculator is a tool that takes your PT and converts it into an INR value using the following formula: INR = (Patient’s PT / Mean Normal PT) ^ ISI. Where: Patient’s PT is the prothrombin time measured in seconds. Mean Normal PT is the average prothrombin time of a healthy population.
Prothrombin Time can be interpreted using the International Normalized Ratio (INR), which provides a standardized measure of PT. The formula for calculating INR is: INR = (Patient's PT / Mean Normal PT) × International Sensitivity Index (ISI)
30 Ιουν 2010 · A calculator for determining international normalized ratio (INR). Want to view more content from Clinical Advisor?. Register now at no charge to access unlimited clinical news with personalized ...
6 Απρ 2010 · The INR is calculated from the following formula: INR = (PT patient / PT normal ) ISI • PT patient is the patient’s PT result expressed in seconds. • PT normal is the laboratory’s geometric mean value for normal patients expressed in seconds.
Formula: INR = (PT patient /PT normal) ISI. Where, PT patient = Patients Measure PT (seconds) PT normal = Laboratorys Geometric Mean Value for Normal Patients (seconds) ISI = International Sensitivity Index. Example. The PT of a patient receiving oral anticoagulant is 64 seconds (= 18% Quick).
