And this deficiency is called hemophilia A (or classic hemophilia).

这种缺乏症也称作血友病A（甲型血友病）或者经典血友病。

Treatment for hemophilia A and B are done with injections of the missing or nonfunctional clotting factor.

治疗血友病A和B的方法通常是注射那些缺失或失活的凝血因子。

For hemophilia A, desmopressin, also called DDAVP (1-deamino-8-D-arginine vasopressin) is helpful for patients with mild, quantitative factor VIII deficiency.

对于血友病A，去氨加压素（DDAVP）有助于治疗轻症因子VIII数量缺乏。

To confirm hemophilia A or B, tests to look at specific factor activities, and mutation testing of the genes encoding them, can be done.

为确诊血友病A或B，可以检测特定因子的凝血活性或进行基因诊断。

Now, a mimic of hemophilia A is von Willebrand disease, which is an inherited problem with primary hemostasis caused by a deficiency of von Willebrand factor.

还有一种类血友病A，即血管性血友病，是一种遗传性的初级止血障碍，由血管性血友病因子（vWF）缺乏引起。

In the family of disorders known as hemophilia, a patient can usually complete the first two steps of hemostasis just fine, but they can't make an effective fibrin clot.

在被称为血友病的疾病家族中，病人通常可以很好地完成止血的前两个步骤，但是他们不能制造有效的纤维蛋白凝块。

Signs and symptoms hemophilia A and B are nearly clinically identical, which makes sense since factors VIIIa and IXa work together in the coagulation cascade to activate factor X.

血友病A和B的体征和症状在临床上几乎相同，也说得通，因为因子VIIIa和IXa在凝血级联反应中，共同作用以激活因子X。

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）。