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Prothrombin Time is used to measure how long it takes for the blood to clot. It can also be called as INR which stands for International Normalized Ratio. The INR is used to standardize the result of PT no matter what the testing method is. If PT is more than 2.5 times the controlled value or when the INR is more than 4.0, the person tested is in high risk for bleeding.

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This is the Fifth of my series explaining the Coagulation Fishbone Diagram with the Focus on Coumadin and Heparin with PT prothrombin Partial Thrombin Time PTT and INR International Normalized RationElect rolytes Hyponatremia VS Hypernatremia Hyperkalemia and Hypokalemia will be next along with BUN and Creatinine and glucose, Study sheets for nurses! The Nurses Notes Nursing School

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partial thromboplastin time | ... » Mnemonic Monday: Partial Thromboplastin Time vs Prothrombin Time.

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The prothrombin time (PT) and its derived measures of prothrombin ratio (PR) and international normalized ratio (INR) are measures of the extrinsic pathway of coagulation.

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The partial thromboplastin time (PTT) or activated partial thromboplastin time (aPTT or APTT) is a performance indicator measuring the efficacy of both the "intrinsic" (now referred to as the contact activation pathway) and the common coagulation pathways. Apart from detecting abnormalities in blood clotting,[1] it is also used to monitor the treatment effects with heparin, a major anticoagulant. It is used in conjunction with the prothrombin time (PT) which measures the extrinsic pathway.

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