<prompt> Which one of the following parameter is consistent with pleural transudate?Ldh23 of upper limit of serum ldhWBC -1500mm3Specific gravity-1.120Protein-2.5gramdl  <response>: Pleural fluid LDH levels greater than 1000 IUL suggest empyema, malignant effusion, rheumatoid effusion, or pleural paragonimiasis. The diagnosis is suggested by a pleural fluidserum LDH ratio of greater than 1, with a pleural fluidserum protein ratio of less than 0.5 Normal levels of LDH in the blood can vary depending on the lab, but usually range between 140 units per liter UL to 280 UL for adults and tend to be higher for children and teens Ref Davidson edition23rd pg 626 