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Glucose interference in direct ion-sensitive electrode sodium measurements.

Asila Al-Musheifri1, Graham R D Jones

  • 1Department of Chemical Pathology, St Vincent's Hospital, Victoria St Darlinghurst, Sydney, NSW 2010, Australia.

Annals of Clinical Biochemistry
|August 30, 2008
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Summary

Direct and indirect ion-sensitive electrode (ISE) methods for measuring serum sodium can differ significantly in cases of severe hyperglycemia. High glucose levels directly impact ISE sodium readings, potentially affecting patient sodium status interpretation.

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Area of Science:

  • Clinical Chemistry
  • Electrolyte Measurement
  • Analytical Biochemistry

Background:

  • Serum sodium concentration is a critical biomarker measured using direct and indirect ion-sensitive electrode (ISE) methods.
  • Discrepancies between direct and indirect ISE sodium measurements can occur, necessitating investigation into underlying causes.

Observation:

  • An unusual case presented with markedly elevated serum glucose (162 mmol/L) and a 9 mmol/L higher direct ISE sodium measurement compared to indirect ISE sodium.
  • No other causes for pseudohyponatremia were identified in the patient's presentation.

Findings:

  • In vitro experiments demonstrated that very high glucose concentrations artifactually increase sodium readings in direct ISE measurements.
  • This glucose-induced effect alone did not fully explain the observed sodium discrepancy, suggesting other factors like pH and bicarbonate concentration also play a role.

Implications:

  • Gross hyperglycemia can significantly influence the accuracy of direct ISE sodium measurements.
  • Clinical interpretation of serum sodium status in patients with severe hyperglycemia requires careful consideration of potential measurement interferences.