I have seen in few hospitals in all cases of severe oligohydramnios babies are subjected to kidney function test and or renal  ultrasound in order to not miss conditions like bilateral renal agenesis, renal dysplasia etc. Do you think this practice is justified ? 

we don’t have a written guideline, but if the infant is doing well, and passing  urine  normally, we’d don’t do renal investigations per routine. However, in infants smaller than -3 SD in weight, we tend to screen more, often also blood and USG for renal morbidities. 

Agreed