Afternoon Urine Osmolality Is Equivalent To 24-h In Healthy 3-13 y Children

While daily hydration is best assessed in a 24-h urine sample, using a urine spot sample can be more practical for healthcare professionals, researchers, and individuals. Although urine product is subject to circadian variation, 24-h urine concentration reported to be approximated from a mid- to late-afternoon spot urine sample in adults. However, no data exists in children. PURPOSE: To identify time windows during which spot values of urine...