“…Higher concentration of tPA in patients with COVID-19 than in healthy donors has been reported [ 40 ], yet the clot lysis time was higher indicating lower overall fibrinolysis activity [ 82 ]. The concentration of tPA does not always predict the endogenous enzymatic activity of tPA, owing to inactivation of the enzyme by inhibitors and other inhibitory mechanisms [ [46] , [47] , [48] , [49] , [50] ].…”