- Immune complex assoc vasculitis
- Persistent cough
- Concurrent acute kidney injury from glomerulonephritis
- UA + RBCs, protein; Urine microscopy w/rbc casts, dysmorphic RBCs
- Serum: decrease in GFR; + anti-GBM ABs
- Biopsy w/proliferative GN, w/crescents; Ig along GBM w/immunofluorescence