Used in research settings to detect and quantify IgM antibodies against the heparin-PF4 complex in human serum or plasma. This assay helps investigate immune responses associated with heparin-induced thrombocytopenia (HIT), particularly in identifying IgM-mediated reactions that may contribute to thrombotic risk. The kit supports studies on autoimmune mechanisms, drug-induced thrombocytopenia, and patient stratification in clinical research. It is not intended for diagnostic use but serves as a tool for understanding antibody profiles in suspected HIT cases and related immunological conditions.