Partial Thromboplastin Time (PTT) The partial thromboplastin time (PTT) take a look at also steps the velocity of clotting but differs from the PT exam in that it aims to ascertain how blood clots in just a blood vessel (intrinsic pathway). After activated, the PT exam is measured in seconds. https://morningdirectory.com/listings561110/top-guidelines-of-%E5%A8%9B%E6%A8%82%E5%9F%8E%E5%AE%98%E7%B6%B2