Figure 5. The diagnostic value of the IL-31 levels in the pleural fluid and plasma for tuberculous pleurisy.
First, the result of the test was considered positive if the concentration of IL-31 in pleural fluid ≥67.5 pg/mL. Thus, 48 patients were judged to be negative. Second, these 48 patients were considered to be positive if the concentration of antigen-specific IL-31 in the plasma ≥23.9 pg/mL. Thus, 6 cases were judged to be positive. The sensitivity and specificity of the combination of the pleural fluid and plasma IL-31 levels were 94.0% and 95.1%, respectively.TPE: Tuberculous pleural effusion; MPE: Malignant pleural effusion.