<prompt> Feature of exudates pleural effusion isPleural fluid protein: Serum protein ratio 0.5Pleural fluid protein: Serum protein ratio 0.8Pleural fluid protein: Serum protein ratio0.5Pleural fluid protein: Serum protein ratio 1.0  <response>: According to Lights criteria for distinguishing pleural transudate from exudate,exudate is likely if one or more of the following criteria are met-Pleural fluid protein:serum protein ratio0.5;Pleural fluid LDH:serum LDH ratio0.6;Pleural fluid LDH23 rds of the upper limit of normal serum LDH. Reference:Davidsons medicine-22nd edition,page no:662. 