e-TABLE 94.9 PLEURAL FLUID CHARACTERISTICS OF PLEURAL EFFUSIONS Variable Exudate a Transudate b Appearance Cell count (mean WBC/mm3 ) Purulent >25,000 Serous 1,000 Neutrophilic predominance Protein (fluid/serum ratio) LDH (IU/L) c LDH (fluid/serum ratio) c Glucose (mg/dL) c pH c >95% >0.5 >200 >0.6