Evaluation of a Cincalcet Suppression Test

Inclusion Criteria: * Control group: healthy adult (\>18 years), having signed informed consent, taking no treatment, with effective contraception in unmenopausal women, with normal clinical examination, with normal plasma PTH, calcium, phosphorus, 25 OH vitamin D levels, with normal renal function, with normal 24 hour calciuria. * Primary hyperparathyroidism group: adult patients (\>18 years), having signed informed consent, with effective contraception in unmenopausal women, taking no treatment known to modify calcium-phosphorus status, with normal BMI, in which the diagnosis of primary hyperparathyroidism was confirmed on plasma PTH, calcium, phosphorus, 25 OH vitamin D levels, with normal renal function, with 24 hour calciuria higher than normal. Exclusion Criteria: * Control group: significant medical or surgical history, creatinine clearance \<60 ml/min, liver insufficiency, arterial hypertension, psychiatric disorder able to modify the compliance to the study, tobacco intoxication, taking a treatment known to modify calcium-phosphorus status, severe known allergy, pregnant women, unmenopaused women without contraception. * Primary hyperparathyroidism group:secondary hyperparathyroidism, creatinine clearance \<60 ml/min, liver insufficiency, psychiatric disorder able to modify the compliance to the study, tobacco intoxication, taking a treatment known to modify calcium-phosphorus status, severe known allergy, pregnant women.