<prompt> All of the following characteristics are found in pleural effusion fluid of a rheumatoid ahritis patient except:RA factor positiveHigh glucoseCholesterol crystalsHigh LDH  <response>: Since pleural fluid in RA is an exudate it will have low sugar values. Cholesterol crystals are seen in long standing pleural effusion of RA. High LDH is explained by Lights criteria. Differentials if glucose in pleural fluid is less than 60 mgdl Glucose 60 mgdL Consider: Malignancy Bacterial infections Rheumatoid pleuritis 