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ISSN: 2161-0665

Pediatrics & Therapeutics
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Research Article

Utility of Urine Calcium and Phosphate as Screening Tools for Vitamin D Deficiency in Children

Matthew R. Benson1,2, Katie Black1 and Robert C. Olney1*

1Nemours Children’s Clinic, Division of Endocrinology, Diabetes and Metabolism, USA

2University of Florida College of Medicine, USA

*Corresponding Author:
Robert C. Olney
Nemours Children’s Clinic
Division of Endocrinology
Jacksonville, FL 32207, USA
Tel: 904 697 3674
Fax: 904 697 3948
E-mail: [email protected]

Received Date: December 19, 2011; Accepted Date: January 26, 2012; Published Date: February 01, 2012

Citation: Benson MR, Black K, Olney RC (2012) Utility of Urine Calcium and Phosphate as Screening Tools for Vitamin D Deficiency in Children. Pediatr Therapeut 2:111. doi: 10.4172/2161-0665.1000111

Copyright: © 2012 Benson MR, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Objective: Vitamin D deficiency is estimated to affect one billion people worldwide. In the United States, 9-12% of healthy children have vitamin D deficiency. Renal calcium and phosphate excretion in healthy people is a sensitive indicator of total body mineral balance. We explored the possibility of using urine calcium-to-creatinine (Uca/Ucr) and urine phosphate-to-creatinine (Uphos/Ucr) as noninvasive biomarkers of vitamin D deficiency in at risk children. Patients and methods: This was an observational study of children with one or more risk factors for vitamin D deficiency. Anthropometric data and a physical exam were obtained in all children and skin pigmentation, sunlight exposure, dietary history, and frequency of vitamin supplementation of both mother and child were determined by parent report. We measured serum levels of calcium, phosphate, magnesium, intact PTH, 25-hydroxyvitamin D, alkaline phosphatase, and creatinine. A random urine sample was collected for calcium, phosphate and creatinine.
Results: A total of 60 healthy children were recruited. Mean age of the subjects was 1.4 (range 0.5 to 2.9) years. Twenty percent of the children were regularly given vitamin D supplements. The prevalence of vitamin D deficiency (25-hydroxyvitamin D < 50 nmol/L) was 3.4%, vitamin D insufficiency (≥ 50 and < 80 nmol/L) was 28.6% and vitamin D sufficiency (≥ 80 nmol/L) was 68%. One subject had biochemical evidence of rickets. Linear regression analysis showed no correlation between 25-hydroxyvitamin D levels and random Uca/Ucr or Uphos/Ucr.
Conclusion: Random urine calcium or phosphate levels offer little promise as screening tools for vitamin D deficiency in children.

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