A 52-year-old man with a 10-year history of rheumatoid arthritis presents with progressive dyspnea. Chest X-ray reveals a left-sided pleural effusion. Thoracentesis is performed and pleural fluid analysis shows: protein 4.2 g/dL, LDH 220 IU/L, glucose 15 mg/dL, pH 6.8, cholesterol 80 mg/dL. Which of the following findings is NOT consistent with rheumatoid pleural effusion?

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