Craven was convinced that aspirin was preventing prothrombin, one of the factors in blood clotting.

克雷文确信阿司匹林可以预防凝血酶原，凝血酶原是血液凝固的因素之一。

Factor Xa, with Factor Va as a cofactor, turns factor II (also called prothrombin) into factor IIa or thrombin.

活性因子Xa和作为辅因子的因子Va将因子II（凝血酶原）转变为因子IIa（凝血酶）。

Finally, an elevated or prolonged prothrombin time, which is the time it takes your blood to clot, is a typical lab finding in more severe cases.

最终，凝血酶原时间延长，即血液凝固的时间，也是更严重自免肝病例的典型实验室指标。

Diagnosis of hemophilia A and B usually starts with lab tests including a platelet count which is usually normal, a prothrombin (PT) time, and a partial thromboplastic (PTT) time.

血友病A和B的诊断通常是进行实验检测，包括血小板计数（一般正常）、凝血酶原时间（PT），以及部分凝血活酶时间（PTT）。

There is also a prolonged prothrombin (or PT) time, as well as prolonged partial thromboplastin time (or PTT), both of which reflect having lower levels of circulating coagulation factors.

凝血酶原（PT）时间和部分凝血活酶（PTT）时间均会延长，两者都反映出血液循环中低水平的凝血因子。

Plasma is the liquid part of the blood and consists of water, dissolved proteins, sugar, salts, hormones, and other substances. The four major plasma proteins are albumin, globulin, fibrinogen, and prothrombin.

血浆是血液的液体部分，由水，溶解的蛋白质，糖，盐，激素和其他物质组成。四种主要的血浆蛋白是白蛋白，球蛋白，纤维蛋白原和凝血酶原。