Immunoglobulin A(IgA) Determination Reagent(Immunoturbidimetry) is an in vitro diagnostic quantitative test kit. This test is used to evaluate humoral immunity or monitor therapy in IgA myeloma. Increased monoclonal IgA may be produced in lymphoproliferative disorders, especially multiple myeloma and “Mediterranean” lymphoma involving bowel. An IgA monoclonal peak >2 g/dL is a major criterion for myeloma. It may be elevated in a wide range of conditions affecting mucosal surfaces, where IgA is largely produced.