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Light’s criteria
| Pleural fluid is an exudate if one or more of the following criteria are met: 1. Pleural fluid protein divided by serum protein is >0.5 2. Pleural fluid lactate dehydrogenase (LDH) divided by serum LDH is >0.6 3. Pleural fluid LDH >2/3 the upper limits of laboratory normal value for serum LDH. |
