There is no validated self-questionnaire to assess salt and potassium intake in nephrology patients.

Using Bayesian models, researchers developed clinical prediction tools to estimate salt and potassium intake in nephrology patients. These prediction tools performed well, with an accuracy of 89% for salt and 74% for potassium, and have undergone internal validation.

Currently, the investigators wish to conduct an external validation study of these clinical prediction tools using data from patients followed at 3 nephrologic centers to generalize the performance results of the tools.

Inclusion Criteria:

• Male or female 18 years of age or older
• Consultant or inpatient in the nephrology department
• Having performed a 24-hour urinary assessment as part of his usual management with analysis of natriuresis and/or kaliuresis.

Exclusion Criteria:

• Patient having lost salt by vomiting, diarrhea and intense sweating (sport) in the week preceding the 24-hour urine collection.
• Person protected by the french law

The study population will be composed of patients consulting or hospitalized in day hospital in the nephrology department of one of the three centers participating in the study: Hôpital Lyon Sud (Hospices Civils Lyon), AURAL (Association pour l'Utilisation du Rein Artificiel dans la région Lyonnaise) Lyon and Hôpitaux Universitaires de Bordeaux. It is therefore composed of patients suffering from different types of nephropathy (lithiasis, diabetes, hypertension, tubulo interstitial, glomerular, autosomal dominant polycystic or other) whatever the stage of their disease and of healthy volunteers (living donors).