<prompt> All are true about antenatal umbilical aery Doppler except?Decreased diastolic flow of umbilical aery is suggestive of IUGRSD Ratio of umbilical aery is less than SD ratio of Fetal MCASD Ratio is decreased in smoking femalesReversal of diastolic flow in umbilical aery Doppler suggests impending Fetal demise  <response>: SD Ratio of umbilical aery Doppler is increased in smokers. Decreased, absent or reversal of diastolic flow on umbilical aery Doppler suggests fetal IUGR and impending Fetal death. Fetal MCA SD ratio is normally more than SD ratio of umbilical aery. Fetal MCA SD ratio is less than SD ratio of umbilical aery Doppler in IUGR. 