EPISODE · Apr 1, 2026 · 16 MIN
Umbilical Artery Doppler & FGR: Understanding Placental Physiology
from The Seasoned Sonographer · host Lynn Flamm
In this episode we discuss: Definition of FGR (EFW Early asymmetric FGR and the significance of abdominal circumference Causes of FGR Fetal circulation and placental resistance Proper umbilical artery Doppler technique S/D ratio, PI, RI Absent and reversed end-diastolic flow ACOG-aligned monitoring and delivery principles When sonographers should add UA Dopplers Why UA Dopplers are clinically valid after 24 weeks gestation Referenced guidance: American College of Obstetricians and Gynecologists Practice Bulletin on Fetal Growth Restriction © 2026 Lynn Flamm, RDMS Founder & CEO, Sono Techniques Academy, LLC Host, The Seasoned Sonographer Podcast For educational purposes only. Clinical management should follow current ACOG guidance and physician direction. I’d love to hear your thoughts, questions, or even topics you’d like me to cover—connect with me @SonoTechniquesAcademy on Facebook facebook.com/profile.php?id=61574057043515 and Instagram instagram.com/sonotechniquesacademy or send me an email at [email protected]. Disclaimer: The information provided in this podcast and any accompanying materials is for educational and informational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. While every effort is made to ensure accuracy, the content is provided “as is” and without warranties of any kind.Always seek the guidance of your physician, qualified healthcare provider, or credentialed ultrasound professional with any questions you may have regarding a medical condition, scan interpretation, or clinical decision-making.The views and opinions expressed are those of the host and guests and do not necessarily reflect those of any organizations or employers. The host assumes no responsibility or liability for any errors or omissions in the content or for any outcomes related to its use.Listeners and participants are solely responsible for how they use the information shared in this podcast or training program.
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What this episode covers
Lynn Flamm, RDMS, is joined by OB/Gyn physician Dr. Danielle Tomevi to discuss Umbilical Artery Doppler in the evaluation and management of fetal growth restriction (FGR). This episode connects fetal circulation, placental insufficiency physiology, proper Doppler technique, interpretation of PI and RI, abnormal findings, and ACOG-aligned monitoring principles. Sonographers will learn when Dopplers are indicated — and why understanding physiology elevates clinical care.
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Umbilical Artery Doppler & FGR: Understanding Placental Physiology
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