A 60-Year-Old Man Comes to the Office Due to Persistent

A 60-year-old man comes to the office due to persistent cough for the past several weeks.  He reports producing minimal sputum that recently has contained occasional specks of blood.  The patient also has anorexia and has lost 7 kg (15.4 lb) over the past 2 months.  He has no previous medical conditions and takes no medications.  The patient has smoked a pack of cigarettes daily for 40 years and drinks alcohol on social occasions.  Temperature is 37.1 C (98.7 F) , blood pressure is 130/80 mm Hg, pulse is 72/min, and respirations are 16/min.  On physical examination, respirations are unlabored, and there are occasional wheezes on the left side.  The remainder of the examination shows no abnormalities.  A chest x-ray reveals a hilar mass with adenopathy on the left side.  Laboratory results demonstrate a decreased serum sodium level.  Which of the following additional laboratory abnormalities are most likely to be present in this patient?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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