Acute kidney injury is a frequent and growing complication associated with a risk of progressing into a chronic kidney disease. Recent guidelines have recommended systematic consultations with a nephrologist 3-6 months following hospitalization. Risk factors of developing chronic kidney disease between hospital visits are understudied.

Inclusion Criteria:

• Age >18 years
• Suffering from acute kidney injury treated with dialysis
• hospitalized in a university center from August 2016 to December 2017 with severe AKI defined according to 2 of the 3 criterion definitions of KDIGO stage AKI: an increase in SCr above 354 μmol/Lor renal replacement therapy (RRT) indication, but not the 3-fold increase in SCr increase within 7 days with SCr below 354 μmol/L.
• The patient has been informed and does not oppose the study
• The patient is insured or the beneficiary of a health insurance policy

Exclusion Criteria:

• The patients is under judicial protection or state guardianship
• Patient has chronic kidney disease(CKD) KDIGO stage 5
• It proves impossible to give the patient clear information
• patients living with kidney transplant
• plan dialysis for bilateral surgery nephrectomy
• patient refuse to participate and patients with no health insurance

Patients undergoing dialysis for acute kidney injury. All new adults (>18 years old) hospitalized in a university center with severe AKI was included from August 2016 to December 2017. Inclusion criteria was a severe AKI defined by dialysis start for AKI or an increase of Scr upper 354 μmol/L. Exclusion criteria was CKD stage 5 , patients living with kidney transplant, plan dialysis for bilateral surgery nephrectomy, patient witch justice protection and refuse to participate. Eligible patients were identified by physicians for ICU and nephrology department and by laboratory biochemistry department for others wards. A Biochemistry alert system controlled the exhaustively of inclusion in ICU and Nephrology department during the period of the study.