1. pl protein/ serum protein > 0.52. pl LDH/ serum LDH > 0.63. pl LDH > 2/3(ULN of serum LDH)2/3 criteria means exudative; all negative is transudate

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1. pl protein/ serum protein > 0.52. pl LDH/ serum LDH > 0.63. pl LDH > 2/3(ULN of serum LDH)2/3 criteria means exudative; all negative is transudate

Light’s Criteria