Criteria for the Specific Measurement of Plasmin Inhibitor Activity Using an Enzymatic Procedure.

There is a lack of well-established criteria for the specific measurement of fibrinolytic parameters. On behalf of the SSC, the subcommittee on Fibrinolysis started a process to develop criteria for the specific measurement of fibrinolytic variables. This report describes the criteria for the specific measurement of plasmin inhibitor activity. In summary, a plasma deficient in plasmin inhibitor should show an activity close to 0%. Plasma containing only the non-plasminogen binding form of plasmin inhibitor should show an activity nearby the activity of a plasma deficient for plasmin inhibitor. Other inhibitors of plasmin, like a 2 -macroglobulin, antithrombin in the presence of heparin, and C1-esterase inhibitor should not interfere in the assay at the level usually found in pathological conditions or at the higher normal level.