Used in research settings to detect and quantify IgA antibodies against the heparin-PF4 complex in human serum. This assay helps investigate immune responses associated with heparin-induced thrombocytopenia (HIT), particularly in cases where IgA antibodies may play a role. It supports studies exploring atypical or serodiscordant HIT presentations, contributing to a better understanding of the immunological mechanisms involved. The kit is not for diagnostic use but serves as a tool for immunological research and laboratory investigation.