Learn how to pinpoint the cause of prolonged PT / PTT and investigate bleeding in patients with normal PT / PTT. In this video, you will learn the mechanisms behind PT tests and how to interpret the results. You will be able to formulate a common differential diagnosis of prolonged PT and understand which tests to order next. Demystify hematology and coagulation with our fascinating Hematology & Coagulation Essentials course: http://bit.ly/2GgturE | Medmastery

INR (International Normalized Ratio) and PT (Prothrombin Time) are closely related, but they differ in how they’re used and standardized: 1. Prothrombin Time (PT): PT measures the time (in seconds) it takes for blood to clot. Usually 11-13.5 sec. It’s specifically testing the extrinsic pathway of the coagulation system, which involves certain clotting factors (e.g., Factors I, II, V, VII, and X). PT results can vary between labs due to differences in testing methods and reagents. So… 2. Internat