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Serum osmolal gap in clinical practice: usefulness and limitations
George Liamis1, Theodosios D Filippatos1, Angelos Liontos1
1a Department of Internal Medicine, School of Medicine , University of Ioannina , Ioannina , Greece.
Postgraduate Medicine
|March 18, 2017
Summary
The serum osmolal gap is a valuable diagnostic tool, especially for drug overdoses and comatose patients. Understanding its calculation and causes is crucial for effective clinical practice.
Area of Science:
- Clinical Chemistry
- Diagnostic Medicine
- Toxicology
Background:
- Serum osmolal gap is an underutilized diagnostic tool in clinical practice.
- Familiarity with osmolal gap calculations and interpretations is limited among clinicians.
Purpose of the Study:
- To review current data on osmolal gap utility from a clinical perspective.
- To address the use of osmolal gap through a question-and-answer format.
Main Methods:
- Literature review of current data on osmolal gap.
- Clinical point-of-view analysis of osmolal gap calculations and applications.
Main Results:
- Discussion of the definition and optimal formula for osmolal gap calculation.
- Identification of primary causes for elevated osmolal gap, with or without concurrent metabolic acidosis.
- Exploration of the role of lactic acidosis and ketoacidosis in osmolal gap interpretation.
Conclusions:
- Osmolal gap calculation is essential for diagnosing patients with potential substance overdose in emergency settings.
- Crucial for the differential diagnosis of hospitalized patients presenting with altered mental status or coma.
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