Patients with high blood pressure, CKD stages 4-5 and patients free from any diseases
Patients over 18 years old
Patients in nephrology and cardiology consultation or recruited by CIC
Patients with health insurance
Patients willing to follow the full study
You may not be if
Loss of salt by vomiting, diarrhea or sweating (intense sport or intense fever 3 days before urine collection) which can cause a decreasing natriuresis
Modification of the therapeutic management of patients during the study period
Taking certain drugs like effervescent drugs, Gaviscon and Tolvaptan during the day of urine collection, as well as diuretics (unless they are taken long-term and the diuresis is stable) which can cause an increasing natriuresis
