Partial Thromboplastin Time (PTT) The partial thromboplastin time (PTT) examination also measures the speed of clotting but differs through the PT test in that it aims to establish how blood clots within a blood vessel (intrinsic pathway). As soon as activated, the PT exam is measured in seconds. Time is https://thetopsdirectory.com/listings13025802/%E5%8F%B0%E7%81%A3%E7%B7%9A%E4%B8%8A%E5%A8%9B%E6%A8%82%E5%9F%8E-things-to-know-before-you-buy