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Serum ferritin as an activity marker for granulamotosis with polyangiitis
Hamit Kucuk1, Ozkan Varan1, Berna Goker1
1a Department of Internal Medicine, Division of Rheumatology, Faculty of Medicine , Gazi University , Ankara , Turkey.
Background:
Serum ferritin correlates well with the activities of systemic lupus erythematosus (SLE) and dermatomyositis, but it has not been previously studied in patients with vasculitis.
Methods:
Medical records of granulomatosis with polyangiitis (GPA, Wegener's granulomatosis) patients with at least six months of regular follow-up were evaluated. The activity of GPA was assessed with Birmingham Vasculitis Activity Score for Wegener's Granulomatosis (BVAS/WG). Serum ferritin and other acute phase markers were measured at initial presentation.
Results:
Serum ferritin levels were found to be the highest in GPA patients with alveolar hemorrhage, median (IQR) 1041 (1281) μg/L. Patients with renal disease also had high levels of ferritin and it was correlated with concurrent glomerular filtration rate (r = -0.65, p < .001). Serum ferritin is also correlated well with the BVAS/WG scores (r = 0.79, p < .001).
Conclusions:
Measurement of serum ferritin might help in assessing disease activity of GPA.
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