Abbreviation
RPGN: Rapidly progressive glomerulonephritis; anti-GBM: Anti-glomerular basement membrane; ANA: Anti-nuclear antibodies; RF: Rheumatoid factor; HIV: Human immunodeficiency virus; RPR: Rapid plasma reagin test; VDRL: Venereal Disease Research Laboratory; GN: glomerulonephritis, MCD: minimal change disease; FSGS: focal segmental glomerulosclerosis; MPGN: membranoproliferative glomerulonephritis.