The diagnosis of<unk>  A and B may be suspected as coagulation testing reveals an increased PTT in the context of a normal PT and bleeding time. The diagnosis is made in the presence of very low (<10 IU) levels of factor VIII/ IX. 
A very small minority of patients has antibodies against factor VIII that impair its functioning. Management of these patients is more complicated. Development of these inhibitor antibodies in<unk>  B patients is even much less common; but when present, they make the treatment process of the disease very difficult.
Hemophilia A laboratory findings
Von Willebrand disease laboratory findings
Hemophilia A other diagnostic studies
Thrombophilia laboratory findings
Hemophilia laboratory findings
Antiphospholipid syndrome laboratory findings
Glanzmann's thrombasthenia laboratory findings
Hemophilia A risk factors