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Basic concepts and practical equations on osmolality: Biochemical approach.

Mehdi Rasouli1

  • 1Department of Clinical Biochemistry and Immunogenetic Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran.

Clinical Biochemistry
|June 26, 2016
PubMed
Summary

This study formally defines key osmolality terms and provides equations for calculating osmolarity and osmolality. It recommends a simplified formula for serum osmolality and a corrected normal range for the osmolal gap.

Keywords:
Osmlar gapOsmolarityOsmosisOsmotic pressureTonicity

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Area of Science:

  • Biochemistry
  • Clinical Chemistry
  • Physiology

Background:

  • Accurate measurement and calculation of osmolality are crucial in clinical settings.
  • Existing formulas for osmolality calculation can be complex and vary.
  • Understanding the definitions of osmolality-related terms is fundamental.

Purpose of the Study:

  • To formally define key osmolality-related terms.
  • To present equations for calculating osmolarity and osmolality.
  • To recommend the optimal formula for serum osmolality calculation and establish normal ranges for the osmolal gap.

Main Methods:

  • Formal definitions of terms including osmole, osmolarity, and osmolality.
  • Derivation and presentation of equations for calculating osmolarity from various concentration units (mEq/L, mg/L, mg/dL, g%).
  • Presentation of a simplified formula for plasma osmolality calculation: Posm = 2 [Na+] + glucose/18 + BUN/2.8.
  • Definition and calculation of effective osmolality (tonicity): Eosm = 2 [Na+] + glucose/18.

Main Results:

  • Established formal definitions for osmolality, osmolarity, and related terms.
  • Provided equations for rapid osmolarity calculation from different solute concentrations.
  • Identified the simplest and best formula for calculating plasma osmolality.
  • Defined the normal range of plasma tonicity as 275-295 mOsm/kg water.
  • Recommended withdrawing the Dorwart-Chalmers formula and adopting the Worthley et al. equation for serum osmolality.
  • Recommended correcting the normal range of the osmolal gap to 0±2 mOsm/L.

Conclusions:

  • Clear definitions and simplified equations enhance the accuracy and ease of osmolality calculations.
  • The recommended formula and osmolal gap range improve clinical assessment of fluid and electrolyte balance.
  • Standardization of osmolality calculations is essential for consistent clinical interpretation.