The aim of the study is to compare the results of a parathyroid hormone (PTH)suppression test
using a single oral tablet of cinacalcet in two groups of subjects: 1- a group of healthy
adults in whom the results of the test with cinacalcet will be compared with those of the
standardized PTH suppression test with intravenous calcium loading; 2- a group of patients
with proven primary hyperparathyroidism in whom the results of the test with cinacalcet will
be compared with those obtained during the same test, in healthy controls.