It contains active binding interference factor components, specifically targeting at endogenous interference in HAMA, RF, HA and other samples in immune detection. This blocker especially improves the ability of anti-heterophilic antibody (HA). Applicable to all immunoassay platforms LF, CLIA, EIA, TIA, etc. Purity greater than 90%, concentration of 10 mg/mL (0.01M PBS, pH7.4), 0.2μm filtration, no preservatives added.