Adenosine deaminase cutoff value when diagnosing tuberculous pleurisy in patients aged 40 years and older.

ADA and the sLDH/pADA ratio are simple, cost-efficient, and obtain fast results and, therefore, are the preferred methods in TBP diagnosis. The diagnosis rate in the present study was 91% using ADA levels in combination with the sLDH/pADA ratio, both of which can be obtained only through thoracentesis.