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Plasma specific gravity for identifying hypovolaemia

K W Dauterman1, R G Bennett, W B Greenough

  • 1Division of Geriatric Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA.

Journal of Diarrhoeal Diseases Research
|March 1, 1995
PubMed
Summary
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Plasma specific gravity ranges can identify dehydration in older adults. Many elderly emergency room patients show signs of hypovolemia, even without obvious illness.

Area of Science:

  • Gerontology
  • Clinical Chemistry
  • Emergency Medicine

Background:

  • Volume depletion (hypovolemia) is a common concern in older adults, particularly in emergency settings.
  • Accurate identification of hypovolemia is crucial for timely and effective patient management.
  • Existing diagnostic methods may have limitations in assessing hydration status in the elderly.

Purpose of the Study:

  • To establish reference ranges for plasma specific gravity in young and older adults.
  • To determine plasma specific gravity values indicative of volume depletion.
  • To assess the prevalence of hypovolemia in older emergency room patients using these ranges.

Main Methods:

  • Plasma specific gravity was measured in healthy young adults (n=170) and older adults (n=100) to define normal ranges.

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  • Plasma specific gravity was then measured in older emergency room patients (n=68).
  • Defined ranges for hypovolemia: possible (1.0265-1.0279), probable (1.0280-1.0294), and definite (> or = 1.0295).

    • Main Results:

    • Established plasma specific gravity ranges for identifying volume depletion in adults.
    • Older emergency room patients exhibited significantly higher rates of probable hypovolemia (21%) and hypovolemia (16%) compared to control groups (5-8% and 0%, respectively; p < 0.03).
    • A substantial proportion of older ER patients were identified as hypovolemic based on plasma specific gravity, irrespective of obvious fluid-loss conditions.

    Conclusions:

    • Plasma specific gravity measurement provides a useful tool for identifying volume depletion in older adults.
    • Older emergency room patients frequently present with hypovolemia, often without apparent causes.
    • Further research is warranted to explore risk factors and confirm these findings in larger cohorts.