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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.
This INR calculator determines the international normalized ratio to help with monitoring effectiveness of anticoagulation therapy.
INR values provide a uniform way to assess and compare coagulation results, regardless of the testing methods used by different laboratories. The INR is calculated using the following formula: INR = (PT patient / PT control) ^ ISI. PT patient: The prothrombin time for the patient being tested.
How Does the INR Calculator Work? 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.
31 Ιαν 2022 · The INR is then calculated by the following equation: A patient has an unexpectedly prolonged aPTT of > 150 seconds and a normal PT. The patient is not receiving any anticoagulants and has no history of bleeding or thrombosis. The laboratory investigates this unexpected value and identifies a prolonged thrombin time of > 150 seconds.
1 Μαΐ 2023 · International normalized ratio (INR) is the preferred test of choice for patients taking vitamin K antagonists (VKA). It can also be used to assess the risk of bleeding or the coagulation status of the patients.
27 Ιουλ 2017 · To standardize reported PT results, the World Health Organization has introduced International Normalized Ratio (INR). INR= (PT/MNPT)^ISI. PT is the patient’s prothrombin time 1. MNPT is the mean normal prothrombin time 1. ISI is the International Sensitivity Index determined for each batch of thromboplastin reagents by manufactures.
