title: Diagnostic approach to a pleural effusion.
mesh_terms: D001706:Biopsy; D005122:Exudates and Transudates / Q000032:analysis / Q000166:cytology / Q000382:microbiology; D006801:Humans; D007770:L-Lactate Dehydrogenase / Q000032:analysis; D008722:Methods; D010996:Pleural Effusion / Q000175:diagnosis* / Q000209:etiology; D011506:Proteins / Q000032:analysis
chemical_list: D011506:Proteins; D007770:L-Lactate Dehydrogenase