Results of which of the following tests may support the diagnosis of granulomatosis with polyangiitis, eosinophilic granulomatosis with polyangiitis, or microscopic polyangiitis?
Antineutrophil cytoplasmic antibody (ANCA) testing
Tests for serum C-reactive protein (CRP)
Erythrocyte sedimentation rate (ESR)
Measurement of serum albumin
