USMLE step 2 Mcq 211: A 65 year old smoker with a three month history of a dry cough develops bilateral pleural effusions

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Question:
A 65 year old smoker with a three month history of a dry cough develops bilateral pleural effusions. Thoracocentesis reveals a pleural effusion with a Lactic Acid Dehydrogenase level which is is less than 50% of the serum Lactic Acid Dehydrogenase level.
This suggests that:

a) the patient is probably diabetic
b) the patient is likely to have an empyema
c) the protein content of the effusion is likely to be above 4 g/dl
d) the specific gravity of the fluid is likely to be less than 1.02
e) the patient is likely to have a bronchogenic neoplasm


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