Abstract:The relationship between zinc sulfate turbidity test (ZTT) and thymol turbidity test (TTT), and IgG subclasses, especially IgG1 and IgG2, was studied. Serum colloidal reactions of specimens from patients with IgG‐myeloma usually show abnormally high values in ZTT and low values in TTT. But in some cases. values in ZTT and TTT are both low, and in a few cases both values are abnormally high. In order to see the reason why IgG‐myelomas are classified into these three groups according to serum colloidal reactions… Show more
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