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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.
Activated Partial Thromboplastin Time (APTT) Test. The activated partial thromboplastin time (APTT) and the partial thromboplastin time (PTT) tests are very similar in nature and are used to test the amount of time taken by blood to clot in a patient being treated with blood-thinning medicines, especially heparin.ctivated Partial Thromboplastin Time (APTT) Test. The activated partial thromboplastin time (APTT) and the partial thromboplastin time (PTT) tests are very similar in nature and are used to test the amount of time taken by blood to clot in a patient being treated with blood-thinning medicines, especially heparin.