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Routine and rapid enzyme linked immunosorbent assays for circulating anti-glomerular basement membrane antibodies.

Departments of Histopathology, University of Newcastle upon Tyne.

Microtitre plate modifications of the original tube enzyme linked immunosorbent assay (ELISA) of Wheeler and Sussman were used for the routine and rapid assays of anti-glomerular basement membrane antibodies in human sera. In a prospective study of 238 sera from 200 patients, the routine assay (about 24 hours) detected circulating antibodies in seven sera from three patients with active anti-glomerular basement membrane disease. The remaining sera, from patients with a variety of other glomerulonephropathies, were negative by the assay. The rapid assays took less than four hours, and in a retrospective study, detected anti-glomerular basement membrane antibodies in a range of 15 positive sera, with a level of discrimination similar to that observed in the routine assay and with no false positive/negative results.