| Measurement | Renal hypoperfusion | Acute renal failure |
|---|---|---|
| Fractional excretion of sodium (%) | <1 | >4 |
| Urinary sodium (mmol/l) | <20 | >40 |
| Urine:plasma urea ratio | >20 | <10 |
| Urine:plasma creatinine ratio | >40 | <10 |
| Urine:plasma osmolality ratio | >2 | <1.2 |
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