Determination of upper reference value of urinary calcium-creatinine ratio for the paediatric population in Burdwan district

Mrinal Pal, Subinay Datta, Amit Kumar Pradhan, Tapas Ghosh, Amrita Ganguly, Shubhadeep Basu, Joydeep Ghosh, Rajarshi Rahut

Department of Anatomy, Burdwan Medical College, Burdwan, India.
Department of Biochemistry, Burdwan Medical College, Burdwan, India.

DOI: 10.4236/abc.2013.35049                

Abstract

To estimate the rate of excretion of urinary calcium, a 24-hour sample of urine is required and this is not always easy to collect accurately in infant and children. So, random urine calcium to creatinine ratio (Ca/Cr ratio) has been developed. But as the ratio varies worldwide, reference values of the parameter in paediatric population are not developed. To determine reference value, the present study was conducted in healthy paediatric population in Burdwan district, West Bengal. This study was performed on 693 healthy paediatric subjects, aged between 3 months to 18 years and divided into five groups. Early morning non-fasting urine samples from all study groups were analyzed for Ca/Cr ratio. A negative correlation was observed between age and urinary Ca/Cr ratio, but there was no significant difference of urinary Ca/Cr ratio between two sexes. Considering 97.5th percentile of the underlying distribution of values as the upper limit of reference range, upper reference values of urinary Ca/Cr ratio for age groups of <1, 1 -< 2, 2 -< 5, 5 -< 10 and 10 -18 years in mg/mg of 1.61, 1.38, 1.13, 0.89 and 0.71 respectively were derived. As the upper reference values of urinary Ca/Cr ratio of different age groups in present study are different from other previous studies conducted in different areas, we conclude that upper reference value of urinary Ca/Cr ratio should be estimated in every geographic area.

Keywords

Urinary Calcium-Creatinine Ratio; Hypercalcuria; Reference Range

Conflicts of Interest

The authors declare no conflicts of interest.

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