Table 2.

Fractional Excretion of Urinary Uric Acid in Individuals with Normal Renal Function

AgeMeanStandard Deviation 1
0-6 wks29.1%11.7
6 wks-1 yr23.9%10.4
1-3 yrs15.2%6.2
3-13 yrs12.2%5.5
>13 yrsFemale8.0%3.7
Male10.3%4.2

The fractional excretion of urinary uric acid can be calculated as follows: urine uric acid concentration x serum creatinine concentration ÷ serum uric acid concentration x urine creatinine concentration

1.

A fractional excretion of urate >1 SD below the mean suggests reduced urate excretion.

From: Autosomal Dominant Tubulointerstitial Kidney Disease – REN

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