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Related Experiment Videos

Serum bicarbonate declines with sample size in vacutainer tubes.

R D Herr1, T Swanson

  • 1Department of Surgery, University of Utah Medical Center, Salt Lake City 84132.

American Journal of Clinical Pathology
|February 1, 1992
PubMed
Summary

Inaccurate serum bicarbonate tests may stem from underfilled vacutainer tubes. Filling tubes completely is crucial for accurate bicarbonate level measurements in clinical settings.

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Area of Science:

  • Clinical Chemistry
  • Laboratory Medicine
  • Medical Diagnostics

Background:

  • Serum bicarbonate testing accuracy has been questioned in clinical studies.
  • Previous investigations into systemic errors in bicarbonate testing devices yielded inconclusive results.

Purpose of the Study:

  • To investigate the impact of partially filling vacutainer tubes on serum bicarbonate level measurements.
  • To identify potential causes for inaccurate serum bicarbonate readings.

Main Methods:

  • Healthy volunteers' blood samples were collected in varying volumes of 10-mL and 3-mL plain red-top vacutainer tubes.
  • Serum bicarbonate levels were measured using an automated stat analyzer.
  • Linear regression analysis was employed to assess the relationship between sample volume and bicarbonate readings.

Main Results:

  • A significant reduction in serum bicarbonate readings was observed as the volume of blood in the vacutainer decreased.
  • This decrease was consistent across different time points post-blood withdrawal (10-40 minutes) and collection methods.
  • The effect was noted irrespective of vacutainer size (10-mL or 3-mL).

Conclusions:

  • Underfilling of vacutainer tubes is a likely cause of low serum bicarbonate readings.
  • Complete filling of vacutainer tubes is essential for obtaining accurate serum bicarbonate measurements.
  • Standardizing blood collection procedures can improve diagnostic reliability.

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