A 64-year-old female presents with a 5-day history of exerti…
A 64-year-old female presents with a 5-day history of exertional dyspnea and orthopnea. Her medical history is significant for SLE and diastolic heart failure. Chest X-ray reveals significant bilateral pleural effusions. The decision is made to perform a thoracentesis. Which laboratory value would indicate that the effusions are a result of her known diagnosis of SLE?