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Fractional Excretion of Phosphate (FEPO4) Calculator

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Phosphate (Serum) (mEq/L):

Phosphate (Urine) (mEq/L):

Creatinine (Serum) (mg/dL):

Creatinine (Urine) (mg/dL):

FEPO4:

Interpretation:

Formulas and Notes

FEPO4 = [PO4 (Urine) * Creatinine (Serum)] / [PO4 (Serum) * Creatinine (Urine)] * 100

Notes

  • Increased FEPO4 in the setting of normal kidney function is of more clinical relevance than when kidney function is impaired.

Sources

  • Walton RJ, Bijvoet OL. Nomogram for derivation of renal threshold phosphate concentration. Lancet. 1975 Aug 16;2:309-10.
  • Lucas GM, Ross MJ, Stock PG, et al. Clinical practice guideline for the management of chronic kidney disease in patients infected with HIV: 2014 update by the HIV Medicine Association of the Infectious Diseases Society of America. Clin Infect Dis. 2014 Nov 1;59:e96-138.

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