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Updated: Jun 14, 2026
07:54
Cholesterol Efflux Assay
Published on: March 6, 2012
Cholesterol in pleural exudates depends mainly on increased capillary permeability
Luis Valdés1, Esther San-José, Juan Carlos Estévez
1Pulmonology Department, University Clinical Hospital Complex, Santiago de Compostela, A Coruña, Spain. luis.valdes.cuadrado@sergas.es
Summary
Pleural fluid cholesterol levels can be predicted by serum cholesterol. Increased pleural fluid cholesterol in exudates is linked to capillary permeability, not cell counts.
Area of Science:
- Biochemistry
- Pulmonary Medicine
- Clinical Chemistry
Background:
- Pleural fluid (PF) cholesterol aids in differentiating pleural effusions.
- Pathophysiology of elevated cholesterol in exudates remains unclear.
Purpose of the Study:
- Elucidate the cause of increased PF cholesterol in exudates.
- Analyze cholesterol, lipoproteins (HDL, LDL), apolipoproteins (ApoA, ApoB), and cell counts in PF and serum.
- Investigate correlations between PF and serum lipid levels and capillary permeability.
Main Methods:
- Analyzed 259 patients with pleural effusion (57 transudates, 202 exudates).
- Correlated PF and serum lipid levels, lipoprotein percentages, and protein ratios.
- Assessed relationships between lipids and pleural fluid leucocyte and erythrocyte counts.
Main Results:
- PF cholesterol levels (PFCHOL) strongly correlated with serum cholesterol (SCHOL) and capillary permeability (r=0.885).
- Higher percentage of PF cholesterol was bound to HDL and LDL (91.9%) compared to serum (90%).
- No significant correlation found between lipid levels and pleural fluid cell counts.
Conclusions:
- PF cholesterol can be predicted using serum cholesterol levels.
- The pleural/serum protein ratio may reflect capillary permeability.
- Lipoprotein analysis provides insights into cholesterol accumulation in pleural exudates.
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