Fractional Excretion of Phosphate (FEPO4) Calculator

Calculator description

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.

This calculator operates entirely from your device.
No input variables or data is transmitted between your computer and our servers.

Since you've received 80% or better on this quiz, you may claim continuing education credit.

You seem to have a popup blocker enabled. If you want to skip this dialog please Always allow popup windows for the online course.