Rapidly progressive glomerulonephritis laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Laboratory Findings

Blood Work-Up

Anemia is common among patient with RPGN, mostly due to renally impaired production of erythropoietin or GI bleeding. Eosinophilia may be seen in a subset of patients with Churg-Strauss disease.

Patients with RPGN may show formation of immune complexes and cryoglobulins. Complement C3 levels is usually low in immune-complex mediated RPGN. The presence of ANCA and anti-GBM is variable; their presence is important for classification of disease and further management planning. Anti-GBM levels is However, anti-GBM antibody level is not prognostic and is not associated with disease activity.[1]

On the contrary, literature regarding ANCA-associated glomerulonephritis suggests that levels of ANCA is associated with disease activity and may be used as an index for such purposes.[2][3][4]

ESR and CRP may be elevated and are correlated with the level of inflammation and thus activity of the disease.

Urine Work-Up

References

  1. 1.0 1.1 Hricik DE, Chung-Park M, Sedor JR (1998). "Glomerulonephritis". N Engl J Med. 339 (13): 888–99. doi:10.1056/NEJM199809243391306. PMID 9744974.
  2. van der Woude FJ, Rasmussen N, Lobatto S, Wiik A, Permin H, van Es LA; et al. (1985). "Autoantibodies against neutrophils and monocytes: tool for diagnosis and marker of disease activity in Wegener's granulomatosis". Lancet. 1 (8426): 425–9. PMID 2857806.
  3. Tervaert JW, van der Woude FJ, Fauci AS, Ambrus JL, Velosa J, Keane WF; et al. (1989). "Association between active Wegener's granulomatosis and anticytoplasmic antibodies". Arch Intern Med. 149 (11): 2461–5. PMID 2684074.
  4. Falk RJ, Hogan S, Carey TS, Jennette JC (1990). "Clinical course of anti-neutrophil cytoplasmic autoantibody-associated glomerulonephritis and systemic vasculitis. The Glomerular Disease Collaborative Network". Ann Intern Med. 113 (9): 656–63. PMID 2221646.

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