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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.
The INR is used to make sure the results from a PT test is the same at one lab as it is at another lab. In the 1980âs the World Health Organization determined that patients may be at risk because the results of a PT test would vary from one lab to another, based upon the way the test was done.