Calcium-to-creatinine and phosphate-to-creatinine ratios in random single-voided urine specimens were compared with 24hour calcium and phosphate excretions, respectively, in 67 subjects who were selected prospectively to represent a wide range of renal and parathyroid function as well as urinary calcium and phosphate loss. Simple linear regression analysis revealed significant correlation between the spot urine calcium-to-creatinine ratio and 24-hour total calcium excretion and between the spot urine phosphate-to-creatinine ratio and 24-hour phosphate excretion. Calculating these simple ratios permits easy, rapid, correct, and inexpensive estimation of the daily urinary calcium and phosphate excretion.
(Arch Intern Med. 1991;151:1587-1588)
Gökçe Ç, Gökçe Ö, Baydinç C, et al. Use of Random Urine Samples to Estimate Total Urinary Calcium and Phosphate Excretion. Arch Intern Med. 1991;151(8):1587–1588. doi:10.1001/archinte.1991.00400080083015
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