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Updated: Aug 8, 2026
Bronchoalveolar Lavage (BAL) for Research; Obtaining Adequate Sample Yield
Published on: March 25, 2014
[Analysis of cells and proteins in bronchoalveolar lavage fluid]
M Hanaoka1, K Fujimoto, M Hayasaka
1First Department of Internal Medicine, Shinshu University, School of Medicine, Matsumoto, Japan.
Insights
Analyzing bronchoalveolar lavage fluid revealed distinct cell and protein patterns in various lung diseases. These biomarkers aid in diagnosing conditions like organizing pneumonia and hypersensitivity pneumonitis.
Area of Science:
- Pulmonary Medicine
- Cellular Biology
- Protein Analysis
Context:
- Bronchoalveolar lavage (BAL) fluid analysis is crucial for diagnosing respiratory diseases.
- Previous studies have indicated the importance of cellular and protein markers in BAL fluid.
Purpose:
- To investigate the diagnostic utility of cellular profiles and protein concentrations in BAL fluid from patients with various pulmonary conditions.
- To identify specific biomarkers for differentiating between different interstitial lung diseases and other pulmonary ailments.
Summary:
- Lymphocyte counts were elevated in bronchiolitis obliterans organizing pneumonia, Sjögren's syndrome, sarcoidosis, and hypersensitivity pneumonitis.
- High neutrophil counts were observed in diffuse panbronchiolitis and high-altitude pulmonary edema, while eosinophils indicated eosinophilic pneumonia.
- Elevated CD4:CD8 ratio was noted in stage I sarcoidosis. Increased total protein and albumin in BAL fluid suggested heightened pulmonary microvascular permeability in eosinophilic pneumonia and high-altitude pulmonary edema.
Impact:
- This study provides valuable insights into the differential diagnosis of lung diseases using BAL fluid analysis.
- Identified biomarkers can potentially improve early detection and management strategies for patients with interstitial lung diseases.
- Findings contribute to understanding the pathophysiology of pulmonary microvascular dysfunction in specific conditions.
Abstract:
We studied cells and proteins in bronchoalveolar lavage fluid examined at the First Department of Internal Medicine of Shinshu University Hospital between 1990 and 1994. The samples came from 21 healthy subjects and from 216 patients with various diseases. Lymphocyte counts were abnormally high in patients with bronchiolitis obliterans organizing pneumonia. Sjögren's syndrome, sarcoidosis and hypersensitivity pneumonitis. Neutrophil counts were very high in the patients with diffuse panbronchiolitis and in those with high-altitude pulmonary edema, and eosinophil counts were high in those with eosinophilic pneumonia. The CD4:CD8 ratio was significantly higher in the patients with stage I sarcoidosis than in the healthy subjects. The total protein concentration and the albumin concentration were significantly higher in the patients with eosinophilic pneumonia and in those with high-altitude pulmonary edema than in the healthy subjects, and these findings suggest that in those two conditions the permeability of the pulmonary microvasculature was abnormally high.
