Haematuria in rheumatoid arthritis: a follow up study.

Twenty one patients with seropositive rheumatoid arthritis and previously documented isolated haematuria were recalled at a median 7.7 years (range 3-12) after initial investigation. Eighteen subjects had previously undergone renal biopsy, which had shown mesangial glomerulonephritis in all but four cases. Renal function was found to have remained normal in all patients with previous mesangial changes despite the presence of persistent haematuria in most cases.