A 23-year-old man comes to the physician for a painless lump on the right side of his neck he first noticed two weeks ago. The left supraclavicular lymph node is 2-cm and rubbery. The spleen is palpated 4-cm below the costal margin. The remainder of the physical examination shows no abnormalities. Laboratory studies are most likely to show which of the following?
Decreased hematocrit
Decreased serum potassium
Increased serum lactate dehydrogenase
Increased serum potassium
Increased serum thyroid-stimulating hormone
