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J Clin Microbiol. 1985 February; 21(2): 280-281

Lactic acid levels in pleural fluid from patients with bacterial pleuritis.

ABSTRACT

Pleural fluid lactic acid estimations were carried out on 60 samples by gas-liquid chromatography. Lactic acid levels in 12 patients with bacterial pleural infection were statistically significantly higher (mean, 287 mg/dl; range, 135 to 482 mg/dl) than in 18 patients with malignancy (mean, 71 mg/dl; range, 24 to 157 mg/dl) and 30 other patients with pleural effusions (mean, 19 mg/dl; range, 10 to 57 mg/dl). The determination of pleural fluid lactic acid may help in differentiating between empyema and nonbacterial pleural effusions in most cases. It is of particular value when antibiotic therapy has commenced before specimen collection and may be useful for monitoring therapy.

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