Used in research settings to detect and quantify human anti-heparin PF4 IgG antibodies in patient serum or plasma samples. This assay helps investigate immune responses associated with heparin-induced thrombocytopenia (HIT), a serious adverse reaction to heparin therapy. The kit supports clinical studies, diagnosis validation, and monitoring of HIT-like conditions by measuring antibody levels that form against the heparin-PF4 complex. It is not for diagnostic use but serves as a tool for immunological research and drug development related to thrombotic disorders.