Parathyroid hyperplasia is shown here. Three and one-half glands have been removed (only half the gland at the lower left is present). Parathyroid hyperplasia is the second most common form of primary hyperparathyroidism, with parathyroid carcinoma the least common form.

Which of the following sets of laboratory findings would you expect?

Calcium Phosphorus PTH Calcitonin
A Low High HIgh Low
B High Low Low High
C High Low HIgh Normal
D Low High Low Normal