Fibrinolytic proteins in menstrual fluid collected from women with normal menstrual blood loss (less than 80 ml) were found to be completely exhausted. High levels of tissue plasminogen activator, fibrin(ogen) degradation products, and plasmin-inhibitor complexes were present, but little fibrinolytically active plasmin remained. No difference was observed between days 1 and 2 of menstruation.
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