Table 2.

Laboratory test of pleural effusion

Color	Pale yellow fluid
Pleural opacities	+
Fluid specific gravity	1.033
Ribalta reaction	+
Fibrin	+
White blood cells (cells/μL)	2540
Red blood cells (cells/μL)	1430
Mesothelial cell (cells/HPF)	10–19
Punctured fluid protein (g/dL)	5.0
Punctured fluid LDH (U/L)	346
Carcinoembryonic antigen (ng/mL)	0.7
Carbohydrate antigen 19-9 (CA 19-9) (U/mL)	2
Adenosine deaminase (U/L)	25.8
Pleural fluid protein to serum protein ratio	0.66 (>0.5)
Pleural fluid protein to serum LDH ratio	0.84 (>0.6)