<prompt> True about umbilical aery Doppler isChanges in the flow velocity waveforms of umbilical aery may be impoant in the management of high-risk pregnanciesAbsence of end-diastolic flow is normal at termMaternal smoking decreases SID ratioIncreased diastolic flow indicates worse prognosis  <response>: Ans. Absence of end-diastolic flow is normal at term 