| GFR Categories (ml/min/1.73m²) | A1 Normal to mildly increased <30 mg/g <3 mg/mmol | A2 Moderately increased 30-299 mg/g 3-29 mg/mmol | A3 Severely increased ≥300 mg/g ≥30 mg/mmol | |
|---|---|---|---|---|
| G1 | Normal or high ≥90 | |||
| G2 | Mildly decreased 60-89 | |||
| G3a | Mildly to moderately decreased 45-59 | |||
| G3b | Moderately to severely decreased 30-44 | |||
| G4 | Severely decreased 15-29 | |||
| G5 | Kidney failure <15 | |||