title: Pleural fluid acid as a probable diagnostic aid.
mesh_terms: D002648:Child; D004653:Empyema / Q000097:blood / Q000175:diagnosis*; D006801:Humans; D007773:Lactates / Q000032:analysis* / Q000097:blood; D010996:Pleural Effusion / Q000032:analysis*
chemical_list: D007773:Lactates