reference range for calcium concentration in urine
The body normally keeps serum and intracellular calcium levels under tight control through bone resorption and urinary excretion. The reference range for urine calcium is as follows: Males: 25-300 mg/24-hour specimen*. Females: 20-275 mg/24-hour specimen*. Hypercalciuria: >350 mg/24-hour specimen. *These levels are reflective of individuals with average calcium intake, which is 600-800 mg/day.