collaborative work within 2 hospitals at the CHU of Caen, at the CHRU of Lille, concerning the evaluation of the biological markers of primary hyperaldosteronism (PAH) with the dosage of aldosterone in LC -MS/MS, which is performed in both centers, with two different techniques. The main objective is to define the range of Aldosterone concentrations in LC MS/MS, of renin in an automated method, in populations of healthy volunteers, essential hypertensives, and hypertensives with primary hyperaldosteronism. , in order to establish a threshold for the screening of PAH by the RAR, and for the confirmation of PAH by a dynamic test with an Aldosterone threshold post salt load test.

Inclusion Criteria:

• Patients (18-75 years old) with moderate to severe hypertension, which justifies carrying out an etiological assessment in a hospital environment.
• Assessment carried out in compliance with the standardized measurement conditions of the RAR defined by the SFE consensus,
• Signature of a written consent by the patient

Exclusion Criteria:

• Patient on antihypertensive treatment other than alpha-blockers, calcium channel blockers or centrally acting antihypertensive
• Etiology of secondary hypertension other than PAH