blood plasminogen activator inhibitor 1 level serum plasminogen activator inhibitor 1 level 2019-02-15T10:12:59Z A measurement of the amount of plasminogen activator inhibitor 1 (PAI-1) in a specified sample of serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. PAI-1 is a serine protease inhibitor protein that functions as the principal inhibitor of tissue plasminogen activator (tPA) and urokinase (uPA), the activators of plasminogen and hence fibrinolysis (the physiological breakdown of blood clots). CMO:0003035 PMID:23799078 clinical_measurement_ontology serum PAI1 level serum Serpine1 level serum serpin family E member 1 level sjwang