A 42-year-old man comes to the physician for a 5-month history of fatigue. Blood pressure is 100/70. Physical examination shows darkening of the skin of the forearms. Serum ferritin is 150 ng/mL. Which of the following is most likely to be seen in this patient?
Increased urinary proton secretion
Increased urinary sodium reabsorption
Serum potassium of 3.3 mEq/L
Serum sodium of 140 mEq/L
Serum bicarbonate of 29 mEq/L
