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Relative rate of exudates to transudates by pleural fluid ultrasound score. A pleural fluid ultrasound score was calculated based on presence of floating debris (+1), fibrinous stranding (+1), loculations (+1), pixel density of 3–10 (+1), and pixel density of at least 10 (+2). A pleural fluid ultrasound score of 3 or higher was associated with a high likelihood of an exudative effusion.
