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Recent clinical studies have suggested that serum surfactant protein (SP) A, SP-D and Krebs von den Lungen-6 (KL-6) are potential biomarkers for interstitial lung diseases. Serum levels of SP-A and SP-D have also been found to be elevated in chronic obstructive pulmonary disease (COPD), but their significance has not been evaluated or compared in induced sputum samples obtained directly from the airways.

respiration

Levels of Surfactant Proteins A and D and KL-6 Are Elevated in the Induced Sputum of Chronic Obstructive Pulmonary Disease Patients: A Sequential Sputum Analysis