Background:
Because of difficulty in obtaining a 24-hour urine collection in children, a random sample of urine is often used to calculate the urinary calcium to creatinine ratio. Urinary calcium excretion might be influenced by genetic, geographic area, etc. In this study, the value of urinary calcium, creatinine, sodium and potassium excretion and agerelated reference values for urine calcium to creatinine and sodium to potassium ratio in the 1 to 7-year age children of Andimeshk city in Khuzestan province were determined.