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Is Serum Lactate Necessary in Patients with Normal Anion Gap and Serum Bicarbonate?

  • Author(s): Aronovich, Daniel
  • Trotter, Maykel
  • Rivera MD, Cynhtia
  • Dalley, Michael
  • Farcy, David
  • Betancourt, Michel
  • Howard, Lydia
  • Licciardi, Sharon
  • Cubeddu, Luigi
  • Goldszer, Robert
  • et al.
Abstract

Introduction: There has been an increase in patients having serum lactate drawn in emergency situations. The objective of this study was to determine whether or not it was necessary to obtain a lactate level in patients with a normal serum bicarbonate level and anion gap.

Methods: This is a retrospective chart review evaluation of 304 patients who had serum lactate and electrolytes measured in an emergency setting in one academic medical center.

Results: In 66 patients who had elevated serum lactate (>2.2mmol/L), 45 (68%) patients had normal serum bicarbonate (SB) (greater than 21 mmol/L). Normal anion gap (AG) (normal range <16 mEq/l) was found in 51 of the 66 patients (77%).

Conclusion: We found that among patients with elevated serum lactate, 77% had a normal anion gap and 68% had normal serum bicarbonate. We conclude serum lactate should be drawn based on clinical suspicion of anaerobic tissue metabolism independent of serum bicarbonate or anion gap values. [West J Emerg Med. 2015;16(3):364–366.]

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