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Spurious hyperchloremia and decreased anion gap in hyperlipidemia
Annals of Internal Medicine
|May 1, 1983
Summary
Lipemia can cause falsely high chloride levels and a negative anion gap due to light-scattering interference in lab assays. Accurate diagnosis requires recognizing this common, technique-dependent artifact in hyperlipidemia patients.
Area of Science:
- Clinical Chemistry
- Laboratory Medicine
- Diagnostic Assays
Background:
- Hyponatremia and hyperchloremia are common electrolyte abnormalities.
- A negative anion gap is a rare finding that can indicate laboratory error or specific conditions.
- Lipemia, or high lipid content in blood, can interfere with certain laboratory tests.
Observation:
- A patient with significant lipemia presented with hyponatremia, hyperchloremia, and a negative anion gap.
- The observed hyperchloremia and negative anion gap were attributed to a light-scattering effect in the colorimetric chloride assay.
- This interference was reproducible in vitro and occurred even with moderate lipemia.
Findings:
- Colorimetric chloride assays can overestimate chloride levels in lipemic samples due to light scattering.
- This artifact can lead to the erroneous diagnosis of hyperchloremia and a negative anion gap.
- The degree of overestimation correlates with the degree of lipemia.
Implications:
- Clinicians must consider lipemia-induced assay interference when interpreting electrolyte panels, especially with a negative anion gap.
- This finding expands the differential diagnosis for decreased anion gap, highlighting technique-dependent artifacts.
- Accurate assessment of a patient's fluid and electrolyte status depends on recognizing and accounting for this lipemia artifact.
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