Hepatorenal syndrome feature are -
Urine sodium hepatorenal syndrome Patients with low urine sodium excretion (< 10mEq/L) are at a greater risk of HRS. Urine sodium and creatinine levels are also used to calculate the fractional excretion of sodium, which is helpful in differentiating HRS and prerenal azotemia from intrinsic renal disease Ref Harrison20th edition pg 245
Urine sodium < 10 mEq/L
Normal renal histology
Renal function abnormal even after liver become normal
Proteinuria < 500 mg/day
Kidney