| Where | What's Responsible | Examples |
|---|
| Prerenal | Inadequate blood flow to the kidney | Severe dehydration; prolonged hypotension; renal ischemia or emboli; septic or cardiogenic shock |
| Renal | Injury to kidney glomeruli or tubules | Glomerulonephritis; toxic injury to the kidneys, e.g., by drugs or poisons |
| Postrenal | Obstruction to urinary outflow | Prostatic hyperplasia; bladder outlet obstruction |