Formula Balik
Volum lichid pleural (ml) = Distanta masurata ecografic (mm) x 20
pH lichid pleural < 7.2 = infectie
The fluid is considered an exudate if any of the following are found and a transudate if all are absent (Light’s criteria) –ratio of pleural fluid to serum protein > 0.5, ratio of pleural fluid to serum LDH > 0.6, pleural fluid LDH > two thirds of the upper limits of normal serum value. Pleural fluid cholesterol > 55 mg/dL (1.42mmol/L)may also be a useful in distinguishing an exudate from a transudate.