C3 and Hematuria: Table 1 describes the clinical and workup data for each of these patients; noteworthy findings include patient mean age (45 ± 15.3 years); there was only one patient aged 60+ years; patients were predominantly females (80%); mean 24-hour urinary protein was 2.2 ± 0.9 g/day; all patients had hematuria; and their median serum creatinine was 2.5 (2.0 - 8.6) mg/dL (GFR: 22(6-24) mL/min/1.73m2). The most common staining pattern was cANCA (80%); all had normal serum C3 and C4 levels; and 80% were positive for ANA (Table 1).