Aminocaproic acid should not be used when there is evidence of an active intravascular clotting process.
When there is uncertainty as to whether the cause of bleeding is primary fibrinolysis or disseminated intravascular coagulation (DIC), this distinction must be made before administering Aminocaproic Acid Injection.
The following tests can be applied to differentiate the two conditions:
Platelet count is usually decreased in DIC but normal in primary fibrinolysis.
Protamine paracoagulation test is positive in DIC; a precipitate forms when protamine sulfate is dropped into citrated plasma. The test is negative in the presence of primary fibrinolysis.
The euglobulin clot lysis test is abnormal in primary fibrinolysis but normal in DIC.
Aminocaproic Acid Injection must not be used in the presence of DIC without concomitant heparin.