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August 1991

Use of Random Urine Samples to Estimate Total Urinary Calcium and Phosphate Excretion

Author Affiliations

From the Departments of Internal Medicine (Drs C. Gökçe, Alaşehirli, Taşçi, Çelebi, and Arslan), General Surgery (Dr Ö. Gökce), Urology (Drs Baydinç, Özküçük, and Atikeler), and Clinical Biochemistry (Mr Īlhan), Firat University School of Medicine, Elaziǧ, Turkey.

Arch Intern Med. 1991;151(8):1587-1588. doi:10.1001/archinte.1991.00400080083015

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)