On Doppler studies which is an ominous sign for IUGR fetus :
Absence of end-diastolic frequencies or reverse diastolic flow patterns in the umbilical aery usually indicates poor perinatal outcome. Reference: Dutta's Textbook of Obstetrics 7th edition page no 227
Increase S/D ratio
Reverse diastolic flow
Diastolic notch
All of the above
Diagnosis in obstetrics