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Plasma osmolality in an elderly population.

J Woo1, R Swaminathan

  • 1Department of Medicine, Chinese University of Hong Kong.

Journal of Medicine
|January 1, 1991
PubMed
Summary
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Plasma osmolality in healthy community-dwelling elderly individuals is within the normal range and unaffected by common lifestyle factors. This finding contrasts with previous studies, suggesting disease prevalence influences higher osmolality readings in other elderly cohorts.

Area of Science:

  • Gerontology
  • Clinical Chemistry
  • Physiology

Background:

  • Plasma osmolality is a key indicator of fluid and electrolyte balance.
  • Previous studies on elderly populations reported varied plasma osmolality values, potentially due to differing health statuses.

Purpose of the Study:

  • To determine the normal range of plasma osmolality in healthy, community-dwelling elderly individuals.
  • To assess the influence of age, sex, lifestyle factors, and diuretic use on plasma osmolality in this demographic.

Main Methods:

  • Plasma osmolality was measured in 303 elderly subjects (152 males, 151 females; mean age 70 ± 11 years).
  • Data analysis examined the distribution of plasma osmolality and its correlation with demographic and lifestyle variables.

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Main Results:

  • The distribution of plasma osmolality was normal.
  • Plasma osmolality was not significantly influenced by age, sex, smoking, alcohol consumption, or diuretic use.
  • The mean plasma osmolality and 95% confidence intervals closely matched established reference values.

Conclusions:

  • Healthy elderly individuals living in the community exhibit normal plasma osmolality.
  • The findings suggest that previously reported higher plasma osmolality values in elderly cohorts may be attributable to underlying disease conditions rather than normal aging.