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Serum immunoglobulins and IgG subclasses in patients with glomerulonephritis

Abstract. The serum concentrations of IgG, IgA, IgM and of the four subclasses of IgG were determined by radial immunodiffusion in 103 patients, mean age 42 (range 16–72), with various types of glomerulonephritis. Forty‐nine healthy blood donors, mean age 41 years (range 19–65), served as controls. Kidney biopsies were obtained from all the patients for examination by histopathology and by immunofluorescence. The glomerulopathies were classified according to WHO criteria.