Hydration of individuals and groups is characterised by comparing actual urine osmolality (Uosm) with maximum Uosm. Data of actual, maximum and minimum Uosm in infants, children and adults and its major influencing factors are reviewed. There are remarkable ontogenetic, individual and cultural differences in Uosm. In the foetus and the breast-fed infant Uosm is much [...]

This Position Stand provides guidance on fluid replacement to sustain appropriate hydration of individuals performing physical activity. The goal of prehydrating is to start the activity euhydrated and with normal plasma electrolyte levels. Prehydrating with beverages, in addition to normal meals and fluid intake, should be initiated when needed at least several hours before the [...]

To evaluate the relative utility of clinical and laboratory parameters of dehydration in children for predicting the magnitude of percent less of body weight (PLBW), we studied 97 children who required intravenous fluids for acute dehydration. After a complete history and physical examination, the managing physician made a clinical estimation of dehydration for each child, [...]

OBJECTIVE: To determine the validity and reliability of various clinical findings in the diagnosis of dehydration in children. DESIGN: Prospective cohort study. SETTING: An urban pediatric hospital emergency department. PARTICIPANTS: One hundred eighty-six children ranging in age from 1 month to 5 years old with diarrhea, vomiting, or poor oral fluid intake, either admitted or [...]

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OBJECTIVE--To review published literature regarding dehydration in older individuals and formulate a consensus on the evaluation and treatment of this unrecognized cause of hospitalizations, morbidity, and mortality. DATA SOURCES AND STUDY SELECTION--The literature concerning dehydration in the elderly population from MEDLINE was reviewed from 1976 through 1995. Search terms included dehydration, elderly, evaluation, hospitalization, and [...]

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BACKGROUND AND OBJECTIVES: There is a need for simple method allowing detection of dehydration and hypovolemia. Based on a new theory of homeostatic blood states, we hypothesized that hemodilution following standardized crystalloid fluid bolus can be used to discriminate between baseline normohydration and dehydration, also normovolemia and hypovolemia. METHODS: Computer simulations based on previously published [...]