... It occurs when there is a complete lack (deficiency) of a protein called fibrinogen, which is needed for the blood to clot. ... defect in fibrinogen function, is a different condition.) ... The main risk factor is a family history of bleeding disorders.
www.nlm.nih.gov/medlineplus/ency/article/001313.htm - Medical Encyclopedia
Partial thromboplastin time ( PTT ) Plasma factor VII activity Prothrombin time ( PT ) Diagnosing a bleeding disorder is important so that the doctor can take extra care if you need surgery, and can test or warn other family members who might be affected.
www.nlm.nih.gov/medlineplus/ency/article/000548.htm - Medical Encyclopedia