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What is the formula for the calculation of the INR value?

April 26, 2017calculation Formula INR value

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What is the formula for the calculation of the INR value?

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First a patient’s coagulation time is divided by a healthy individual’s coagulation time (normal value). This ratio represents a patient’s prolonged coagulation time compared to a healthy individual. However, since the sensitivities of the thromboplastins used are different (due to origin), the calculated sensitivity factor (= ISI) must be taken into account. The ISI is an exponent with which the ratio increases the effect.