ALB and chronic kidney disease: Due to the considerable burden and high cost of prevention and management of chronic kidney disease (CKD) in Iran, for the first time, we planned to estimate the prevalence of CKD based on the calculation of estimated glomerular filtration rate (eGFR) using patients’ age, sex, and the measured serum creatinine, in addition to the measured urine albumin/creatinine ratio for all the participants recruited in the third step of survey.