Fractional Excretion of Urea for the Differential Diagnosis of Acute Kidney Injury in Cirrhosis

The aim of this study is to evaluate: * The diagnostic performance of Fractional Excretion of Urea (FEUrea) for the differential diagnosis of acute kidney injury in patients with cirrhosis and ascites presenting to a tertiary care hospital. * The ability of Fractional Excretion of Urea to distinguish between 1. structural group of acute kidney injury (acute tubular necrosis) versus functional group of acute kidney injury (prerenal azotemia and hepatorenal syndrome), and 2. types of functional group (prerenal azotemia versus hepatorenal syndrome type 1).