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Factitious hypobicarbonatemia associated with profound hyperlipidemia
1Division of Nephrology and Hypertension, University of South Florida Morsani College of Medicine , Tampa, FL , USA and.
Renal Failure
|May 22, 2014
Summary
Severe hyperlipidemia can falsely lower bicarbonate levels due to analytical interference. Direct measurement and lipid clearing agents corrected this factitious hypobicarbonatemia in a patient.
Area of Science:
- Clinical Chemistry
- Laboratory Medicine
- Analytical Biochemistry
Background:
- Hypobicarbonatemia and high anion gap are critical clinical indicators.
- Profound hyperlipidemia can pose diagnostic challenges in laboratory testing.
Observation:
- A patient presented with severe hypobicarbonatemia and high anion gap.
- Enzymatic analysis indicated low bicarbonate, but direct ion-selective electrode measurement revealed normal levels.
Findings:
- The discrepancy was attributed to factitious hypobicarbonatemia caused by hyperlipidemia.
- Lipid interference in photometric analysis, specifically light scattering, was identified as the mechanism.
- Treatment with a lipid clearing agent normalized bicarbonate levels.
Implications:
- Highlights the importance of considering analytical interference in patients with hyperlipidemia.
- Suggests direct ion-selective electrode methods for accurate bicarbonate measurement in such cases.
- Emphasizes the need for careful interpretation of laboratory results in the presence of extreme lipemia.
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