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PTT is âpartial thromboplastin timeâ, and PT is âprothrombin time.â Both PTT and PT are tests used for measuring the time taken for the blood to clot. These two tests are mainly conducted for checking for bleeding problems or the chances of excessive bleeding during surgery.
Our textbook shows a chart with various diagnostic tests. All three (PT, PTT, and APTT) are shown, as well as their lab values. For the tests PTT and APTT, it does say they are the same, however it shows different normal lab values for APTT and PTT (not to be confused with PT).ur textbook shows a chart with various diagnostic tests. All three (PT, PTT, and APTT) are shown, as well as their lab values. For the tests PTT and APTT, it does say they are the same, however it shows different normal lab values for APTT and PTT (not to be confused with PT).