Fractional Excretion of Phosphate FEPO4
FEPO4 = Fractional Excretion of Phosphate (%) = [PO4 (Urine) * Creatinine (Serum)] / [PO4 (Serum) * Creatinine (Urine)] * 100
PO4 = Phosphate (S, mEq/L)
PO4 = Phosphate (U, mEq/L)
Cr = Creatinine (S, mg/dL)
Cr = Creatinine (U, mg/dL)
B= blood. S= serum. P= plasma. U= urine

FEPO4 < 10% (< 0.1 fraction) = low
FEPO4 > 20% (> 0.2 fraction) = high

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