Inclusion Criteria :  Age ≥ 18 years Blood pressure ≥ 140/90mmHg on 3 occasions and according to the recommendations of the French Society of Hypertension (6) at the M1 consultation Isolated kidney transplant patient BMI between 16 and 34 kg/cm2 Not opposed to the research  Exclusion Criteria :  History of non-renal transplantation Patients treated with diuretics on the day of inclusion Minors, adults under guardianship and protected persons