NORMAL
URINARY CALCIUM-CREATININE RATIO IN SCHOOLCHILDREN (NORTH OF IRAN-2000)
Sorkhi H, Hajiahmadi M, Omidbakhsh B, Bahramparvar S, Mirbolooki M,
Nephrology Ward, Amirkola Children
Hospital, Babol University of Medical Sciences
Objectives: Increasing of urinary excretion of
calcium ( hypercalciuria ) can cause polyuria, hematuria and stone
formation. Various methods can evaluate urinary calcium such as 24-hr
calcium excretion and random early morning urinary calcium-creatinin ratio.
In children, the last method is more practical. This study was conducted to
determine the normal range of early morning urinary calcium-creatinin ratio
of schoolchildren in north of Iran.
Methods: This is a cross-sectional study performed on
590 schoolchildren aged 7-11 years. Subjects with a history of nephrologic
or urologic disorders were excluded. Urinary samples were taken in early
morning and evaluated for calcium and creatinine. ANOVA and t-tests were
employed for statistical analysis.
Results: Random early morning urinary calcium-creatinin
ratio was 0.25 in all normal schoolchildren. The ratio was 0.26 and 0.24 in
girls and boys, respectively.
Conclusion: According to the results, the normal
range value is similar to some areas and different to other areas. So we suggest
determining of normal urinary calcium excretion in every areas of the
world.