Location |
Right side (73 to 85%) |
Left side (13 to 17%) |
Bilateral (2 to 10%) |
Fluid |
Cell count <250 polymorphonuclear cells per mm3 |
Protein <2.5 g/dL |
Pleural fluid/serum total protein ratio <0.5 |
Pleural fluid/serum lacate dehydrogenase ratio <0.6 |
Serum-to-pleural fluid albumin gradient >1.1 g/dL |
Pleural fluid/serum bilirubin ratio <0.6 |
pH >7.4 |
Glucose level similar to that of serum |
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