The<unk>  test/control ratio of greater than or equal to 1.2 indicates that a defect is present. If the test/control ratio is between 1.1 and 1.2, the test is equivocal. A good way of expressing the result using mixes is to calculate the Rosner index. If A is the<unk>  of normal plasma, B is that of the 1:1 mix and C is that of the patient plasma, then the Rosner index is 100x(B-A)/C. Values above 15 indicate a positive result but in most cases labs set their own cutoff values. If the<unk>  is less than 60 seconds, this suggests that the test plasma is contaminated with platelet fragments; therefore, the test is not valid.
Kaolin clotting time
Thrombin time
Activated clotting time
Partial thromboplastin time
Prothrombin time
Ecarin clotting time
Bleeding time
Activated protein C resistance test