Differentiating features of chylothorax and pseudochylothorax

Pleural fluid triglyceride level, mg·dL–1>110<50
Pleural fluid cholesterol, mg·dL–1<200>200
Chylomicrons in the pleural fluidPresentAbsent
Cholesterol crystals in the pleural fluidNot seenOften seen
Ratio of pleural fluid triglyceride to serum triglyceride>1<1
Ratio of pleural fluid cholesterol to serum cholesterol<1>1
Ratio of pleural fluid cholesterol to pleural fluid triglyceride<1>1
Persistence of turbidity on addition of ethyl etherYesNo