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Diseases of the Pleura

What are Light's criteria, whereby if at least one of the criteria is met, the fluid is defined as exudative?

  1. Pleural fluid-to-serum protein ratio >0.5
  2. Pleural fluid-to-serum LDH ratio >0.6
  3. Pleural fluid LDH >2/3 upper limit of laboratory's normal serum LDH