| AKI Stage | Description |
| Stage 1 | Mild kidney injury with a small rise in blood creatinine or reduced urine output. |
| Stage 2 | Moderate kidney injury, with a greater rise in creatinine or a longer period of reduced urine output. |
| Stage 3 | Severe kidney injury is characterised by a critical rise in creatinine, drastically low urine output, or the immediate need for dialysis. |