Used in immunological research to quantify rabbit platelet factor 4 (PF-4) levels in biological samples such as plasma or serum. Enables monitoring of platelet activation in experimental models, particularly in studies related to thrombosis, inflammation, and immune responses. Commonly applied in cardiovascular research, toxicology studies, and evaluation of drug effects on platelet function in rabbits. Supports detection of heparin-induced platelet activation and related immune mechanisms in preclinical settings.