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Formulae used to calculate the indices of the fractional excretion of sodium, potassium, calcium, phosphorus, uric acid, and urea.
| Fractional Excretion | Formula |
|---|---|
| FE Na% | (UNa × Scr)/(SNa × Ucr) × 100% |
| FE K% | (UK × Scr)/(SK × Ucr) × 100% |
| FE Ca% | (UCa × Scr)/(SCa × Ucr) × 100% |
| FE PO4% | (UPO4 × Scr)/(SPO4 × Ucr) × 100% |
| FE UA% | (UUA × Scr)/(SUA × Ucr) × 100% |
| FE U% | (UU × Scr)/(SU × Ucr) × 100% |
FE—fractional excretion, U—urine concentration, S—serum concentration, cr—creatinine.
