biochemist hold blood sample for factor viii test.

coagulation factor test hemophilia medical bleeding blood bleeding time viii lab coagulation research experiment serology partial thromboplastin diagnostic deformities analysis exam joint pain stiffness tube laboratory partial care assay treatment thrombin antihemophilia prothrombin thromboplastin selective focus patient hospital background blur hot joints hand illness disease health medicine positive inr blood doctor ptt hematology swollen clinic plasma