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The serum osmole gap

J A Kruse1, P Cadnapaphornchai

  • 1Wayne State University School of Medicine, Detroit, Michigan.

Journal of Critical Care
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

Serum osmolality measurement is vital for managing critical illnesses. Understanding serum osmolality and the osmole gap aids in diagnosing toxic ingestions and other clinical conditions.

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Area of Science:

  • Clinical Chemistry
  • Internal Medicine
  • Toxicology

Background:

  • Osmolality quantifies solute concentration in serum.
  • Key contributors to serum osmolality include sodium, urea, and glucose.
  • Accurate assessment is crucial for critical care.

Purpose of the Study:

  • To highlight the clinical significance of serum osmolality.
  • To explain the estimation and measurement of serum osmolality.
  • To discuss the utility and limitations of the osmole gap.

Main Methods:

  • Estimation of serum osmolality using a formula based on sodium, urea, and glucose.
  • Laboratory measurement of serum osmolality.
  • Calculation and interpretation of the osmole gap.

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Main Results:

  • Serum osmolality estimation is practical and valuable.
  • The osmole gap is instrumental in diagnosing methanol and ethylene glycol intoxication.
  • Caveats exist for osmole gap interpretation, including potential false positives/negatives.

Conclusions:

  • Serum osmolality and osmole gap are essential tools in critical care.
  • Applications include diagnosing toxic ingestions, pseudohyponatremia, and guiding therapy.
  • The osmole gap serves as a prognostic indicator in circulatory shock.