Review Question - QID 206186

A 68-year-old woman is brought to the emergency room by her husband following confusion and lethargy of a week’s duration. Two weeks ago she was diagnosed with small cell cancer of the lung but has not yet begun any chemotherapy regimens. She has a 30-pack year history of smoking. She does not take medications. Physical examination reveals decreased deep tendon reflexes symmetrically. Jugular venous pressure is normal, mucous membranes are moist, and no edema is present in the patient’s extremities. CT scan of the brain reveals no abnormalities. Laboratory studies reveal the following:
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