Collection Notes: 24-hour urine specimens must be collected in an acid-washed, detergent-free container. Acidify with HCl. After collection and HCl addition, pH should be < 3.
Clinical Utility: The measurement of urinary phosphorus primarily reflects dietary intake.
Urine (10 mL)
Ambient 24 Hours
Refrigerated 4 Days
Frozen 28 Days
24- hr. Urine (acidified, HCl)
Refrigerated 6 Months
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