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Article Abstract
Background: Bronchoalveolar lavage is considered a helpful tool in the diagnosis of diffuse parenchimal lung diseases such as sarcoidosis. CD4/CD8 ratio is higly specific but not sensitive to distinguish sarcoidosis and other intestitial lung diseases. We aimed to compare the diagnostic value of CD4/CD8 ratio and other lmphocyte subpopulations such as CD3+16+56, CD103+, CD4+CD103+, CD8+CD103+ in bronchoalveolar lavage to distinguish sarcoidosis and other nonsarcoidosis interstitial lung diseases.
Methods: Using the bronchoscopy records from 2006 to 2013, we evaluated 68 patients with biopsy proven sarcoidosis and 72 patients with clinicoradiological and/or biopsy proven diffuse parenchimal lung diseases. Cut off values, sensitivity and specificity were given for aforementioned parameters.
Results: Bronchoalveolar lavage CD4/CD8 ratio, CD4+ T lymphocyte percentage, CD4+103+, CD3+CD103-, CD8+CD103+/CD103+ ratio were significantly higher in sarcoidosis than other diffuse parenchimal lung diseases whereas CD3+103+, CD3+16+56+, CD8+, CD8+CD103+, CD8+CD103+/CD8+ were significantly lower. Best cut off value of CD4/CD8 was 1.34 with sensitivity and specificity 76.4%, 79.4% respectively. The cut off values of CD4/CD8 of >3.5 and >2.5 had specificity 95.9% and 95.3%, respectively and sensitivity 52%, 41%, respectively.
Conclusion: CD4/CD8 ratio is highly specific but not sensitive for sarcoidosis diagnosis. Thus, BAL flow cytometry is not diagnostic alone without appropriate clinicoradiological and/or histopathological findings.
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