Urinary Sodium, Potassium, Chloride, Calcium, Magnesium, Phosphate, Urate and Urea in Healthy Subjects Aged 5–18 Years

Abstract

The determination of urinary electrolytes is helpful in the diagnosis of children with dyselectrolytemia or metabolic acid-base imbalance of unknown origin [1–3]. The urinary excretion of electrolytes has mostly been evaluated by investigating 24-hour urine specimens [4]. The collection of such urine samples is laborious in children without bladder control, in those unable to comply while playing or at school, or in those with acute electrolyte abnormalities. The usefulness of measuring urinary solutes in relation to creatinine in urine has been suggested [5].