Abstract: Objective To evaluate the clinical factors of diagnosing pleural tuberculosis(PT).Methods 70 cases with PT and 70 pleurisy cases with Non-PT were analysed retrospectively.The LR,sensitivity,specificity,positive predictive value,and negative predictive value of pleural ADA,protein,lymphocyte ratio,TB-antibody in blood and pleural fluid,fever and age were calculated respectively.Results The variable with the highest LR+ was ADA,followed by TB-antibody,age,lymphocyte ratio,protein in pleural fluid and fever.If all six variables are positive,the probabilities of PT will be above 99%.If all variables are negative,the probabilities of PT will go down to be less than 1%.If four or above four variables are positive,the probabilities of pleural tuberculosis will be 97%.Conclusion The combination of these six variables can be used to evaluate the PT and to help to conduct the clinical treatment.

Key words: PT, clinical evaluation, LR+