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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.
1 The partial thromboplastin time (PTT) and activated partial thromboplastin time (APTT) may be normal in people who have inherited bleeding disorders but have only mild symptoms. 2  The APTT is used to check treatment of people who are using heparin or other blood-thinning medicine to prevent blood clots. A longer-than-normal PTT or APTT can be caused by liver disease, kidney disease (such as nephrotic syndrome), or treatment with blood thinners, such as heparin or warfarin (Coumadin). 2  A longer-than-normal PTT may be caused by conditions such as antiphospholipid antibody syndrome or lupus anticoagulant syndrome.