title: Assessing the 'at-risk' fetus: Doppler ultrasound.
abstract: OBJECTIVE
  Doppler ultrasound has become an indispensable tool in evaluating pregnancies at risk for conditions such as preeclampsia, intrauterine growth restriction, fetal anemia, and umbilical cord abnormalities. Use of umbilical artery, middle cerebral artery, and uterine artery Doppler has been the mainstay of assessment.
  
  
  RESULTS
  Recent findings promote the use of ductus venosus Doppler to aid in timing delivery of severely growth-restricted fetuses. Whereas initially it appeared that abnormalities in ductus venosus waveform were the endpoint for pregnancies afflicted with intrauterine growth restriction, newer data suggest that these abnormalities may plateau prior to further fetal deterioration as witnessed by changes in the biophysical profile.
  
  
  CONCLUSIONS
  In this review, we will discuss current ultrasound Doppler literature and the recommendations of the experts. We observe that the best algorithm for incorporation of the ductus venosus into intrauterine growth restriction management is yet to be determined. This remains a subject of intense research aimed at optimizing pregnancy outcomes and will be important to follow to provide up-to-date care of our patients.
authors.affiliation: Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Colorado at Denver Health Sciences Center, Aurora, Colorado 80045, USA. Camille.hoffman@ucdenver.edu
authors.forename: Camille
authors.initials: C
authors.lastname: Hoffman
authors.forename: Henry L
authors.initials: HL
authors.lastname: Galan
mesh_terms: D000465:Algorithms; D005260:Female; D005317:Fetal Growth Retardation / Q000175:diagnosis* / Q000628:therapy; D006801:Humans; D020768:Middle Cerebral Artery / Q000000981:diagnostic imaging / Q000196:embryology; D009774:Obstetrics / Q000379:methods; D011247:Pregnancy; D011256:Pregnancy Outcome; D012306:Risk; D018608:Ultrasonography, Doppler / Q000379:methods*; D016216:Ultrasonography, Prenatal / Q000379:methods*; D014471:Umbilical Veins / Q000000981:diagnostic imaging* / Q000196:embryology; D055988:Uterine Artery / Q000000981:diagnostic imaging* / Q000196:embryology