In US: For Research Use Only. Not for Use in Diagnostic Procedures. This is an ON-DEMAND item which requires minimum order quantity and extended lead time. Please Contact Us for a quote. Enzyme immuno-assay designed for specifically measuring heparin-dependent antibodies of IgG, or IgM, or IgA isotype, in human plasma or serum, or in any biological fluid where these antibodies must be measured. Specific isotyping assay. Assay designed for the full isotyping of heparin dependent antibodies for research investigations.