COVID-19 pandemic affected the admission of patients to the hospital especially the older patients (> 65 years old) because of curfews and the reluctance of patients to apply to the hospitals. Chronic kidney disease is characterized with the progressive loss of kidney function over the time and regular follow-up of patients for their kidney function and treatment of complications is recommended in these patients.

The chronis kidney disease patients followed in Nephrology outpatient unit are going to be enrolled in the study and their kidney functions (calculated with the mdrd formula to asses the estimated glomerular filtration rate (eGFR)) will be evaluated 6 months before and after the COVID-19 pandemia. And the rate of initiation of renal replacement therapies and the change in proteinuria will be evaluated 6 months before and after the COVID-19 pandemic.

Inclusion Criteria:

• patients with chronic kidney disease on regular follow-up for 6 months before the COVID19 pandemic.

Exclusion Criteria:

• patients without chronic kidney disease
• patients not on routine follow-up for 6 months before the COVID19 pandemic

patients with chronic kidney disease (eGFR<60 ml/dk) between the ages 18-80 followed up in nephrology outpatient clinic.