Pleural effusion in rheumatoid ahritis is typically associated with all of the following features except?
Glucose > 620 mg/dl
Protein> 3 gm/dl
Pleural fluid protein to serum protein ratio of > 0.5
Pleural fluid LDH to serum LDH ratio of >0.6
Since Rheumatoid ahritis is an inflammatory disease, the rheumatoid effusion is an exudate and is known to have glucose of less than 60mg/dL. Malignancy and bacterial infections (empyema) can also present with low pleural fluid sugar.
Pleural effusion & Pulmonary alveolar proteinosis