Table 1.

Normal 24-h urine lab values of analytes across various age groups *.

Oxalate	<50 mg/1.73 m2/day
Cystine	<60 mg/1.73 m2/day
Citrate	Boys	>125 mg/g creatinine
	Girls	>300 mg/g creatinine
Uric acid	<8 years old	11 mg/kg/day
	8–12 years old	10 mg/kg/day
	>12 years old	7 mg/kg/day
Magnesium	<8 years old	2.5 mg/kg/day
	8–12 years old	1.9 mg/kg/day
	>12 years old	1.8 mg/kg/day
Phosphorus	<8 years old	30 mg/kg/day
	8–12 years old	30 mg/kg/day
	>12 years old	20 mg/kg/day
Creatinine	1–5 years old	20 mg/kg/day
	>5 years old	25 mg/kg/day
Volume	>20 mL/kg/day

* Lab values vary across institution. Data from Michael et al. [69].