blood protein amount blood plasminogen activator inhibitor 1 amount 2021-04-14T15:19:00Z caripark VT:0010926 EFO:0004792 The proportion, quantity, or volume in whole blood, serum, or plasma of plasminogen activator inhibitor 1, the principal inhibitor of tissue plasminogen activator (tPA) and urokinase (uPA), and hence an inhibitor of fibrinolysis. Trait.ontology