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A prospective study was undertaken to establish the incidence of glomerular basement membrane (GBM) antibody-mediated glomerulonephritis and its histopathological characteristics in a clinical group of patients presenting with renal disease. Biopsies from 43 of 409 consecutive patients technically satisfactory for direct immunofluorescent (IF) examination had diffuse and generalized linear localization of host immunoglobulin (Ig); two other badly scarred kidneys tested negative to IF although GBM antibodies were eluted. Confirmatory evidence of GBM antibody-mediated disease in these patients came from whole kidney or biopsy elutions (15 patients), serologic assays for circulating GBM antibodies by indirect IF (9 of 38 patients), radioimmunoassay (26 of 34), and hemagglutination (31 of 32). Although sera were not tested from six patients, circulating antibodies were demonstrated by some test in 36 of 39 of the remainder. Histologically, half of the patients had minor and nonspecific glomerular abnormalities or mild focal proliferative glomerulonephritis. More severely involved kidneys had focal necrotizing (17%), rapidly progressive (7%), and chronic, usually sclerosing, glomerulonephritis (27%). Clinical courses of these patients comparably were quite variable, ranging from indolent microhematuria and/or gross hematuric bouts to progressive renal failure; nephrotic syndrome was observed in 11 patients. GBM antibody-mediated glomerulonephritis may be a relatively mild disease with apparently stable renal function, although 16 patients have experienced functional deterioration, and 11 have progressed to dialysis, renal transplantation, or death.

Glomerulonephritis mediated by antibody to glomerular basement membrane. Immunological, clinical, and histopathological characteristics.