A prothrombin time (PT) test measures the amount of time it takes for your blood plasma to clot. Prothrombin, also known as factor II, is just one of many plasma proteins involved in the clotting ...

Thirteen patients with liver disease and an abnormal prothrombin time refractory to vitamin K therapy were studied (Tables 1 and 2). None of the patients were actively bleeding, and none had received ...

The one-stage method was carried out on several hundred subjects to find the limits of variation in nonhypoprothrombinemic states. As representative samples, the results on 12 normal subjects studied ...