The parathyroid hormone (PTH) level is 10 pg per milliliter ... of systemically acting factors that act on bone, kidney, and intestine to disrupt normal calcium homeostasis.

Zollinger-Ellison syndrome (ZES) is a rare digestive disease caused by a tumor (gastrinoma) in the pancreas or small intestine ... that affects the body's hormone-producing glands. MEN-1 can lead to ...