Mild nephritis | GFR > 80 mL/min/1.73 m2 and early morning UP:UC ratio of < 250 mg/mmol |
Moderate nephritis | < 50% crescents on renal biopsy findings and GFR of < 80 mL/min/1.73 m2 or early morning UP:UC ratio of > 250 mg/mmol for at least 4 wk |
Severe nephritis | > 50% crescents on renal biopsy findings and GFR of < 80 mL/min/1.73 m2 or early morning UP:UC ratio of > 250 mg/mmol for at least 4 wk |