Abstract
A chromogenic substrate kit for determination of factor VIII activity (COATEST Factor VIII) was compared to a one-stage clotting assay and the correlation was evaluated in different genetic variants of mild and moderate haemophilia A, in severe haemophilia A and in all known variants of von Willebrand's disease. In all these cases a high correlation between the two methods was obtained. A good correlation was also obtained after intranasal administration of DDAVP (1-desamino-8-D-arginine vasopressin) to patients with von Willebrand's disease. The chromogenic substrate method was performed using a microtray technique.
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