Background: Acute renal failure (ARF) is a generic term for an abrupt and sustained decrease in renal function resulting in retention of nitrogenous (urea and creatinine) and non-nitrogenous waste products. To determine the cause, prognosis and outcome in patients of Acute Kidney Injury (AKI) admitted in a tertiary care hospital. Materials and Methods: A Hospital based Prospective study was conducted in Department of Medicine, NRI Medical College for a 1 year period (From Septembet 2021 to Aug 2022). Universal Sampling Technique was used for selection of study subjects. All the patients coming to medicine department during the study period and fulfilling the xiii inclusion criteria were taken for study after taking prior informed consent. Final sample size was 138 subjects of Acute Kidney Injury of varied etiology.