Medicine All of the following are components of Light’s criteria for pleural effusion except: A Effusion protein/serum protein ratio greater than 0.5 B Effusion lactate dehydrogenase (LDH)/serum LDH ratio greater than 0.6 C Effusion LDH level greater than two-thirds the upper limit of the laboratory's reference range of serum LDH D Effusion sugar is less than 2/3rd of blood sugar 💡 Explanation All of the following are components of Light's criteria for pleural effusion except: ✓ Correct Answer: D. Effusion sugar is less than 2/3rd of blood sugar