In US: For Research Use Only. Not for Use in Diagnostic Procedures. Two-site ELISA method for the measurement of PAI-1 antigen (Plasminogen-Activator-Inhibitor 1). Assay designed with two complementary Murine monoclonal antibodies specific for PAI-1. The assay measures homogeneously PAI-1 whether its presentation is: free, active, latent, inactive, complexed with tPA, uPA or vitronectin. Controls are included.