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| Urinary findings | ATN | Prerenal uremia |
| Urine sodium | 40 mEq/l | 20 mEq/l |
| Urine/Plasma osmolality | 1.1/ 1 | 1.5/1 |
| FENa | 1% | 1% |
| Urine/Plasma urea | 7/1 | 10/1 |
| Urine volume | Oliguric | 1.5 |
FENa= Fractional sodium excretion; ATN= Acute tubular necrosis
