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Ultrasound/Imaging

Poster Session 4

(1044) Predicting Fetal Weight With Umbilical Cord and Umbilical Vessel Diameter

Wednesday, February 14, 2024

1:00 PM – 2:30 PM

Location: Prince George's Exhibit Hall CDE, Lower Atrium Level

Primary & Presenting Author(s)

Amy Hua, MD (she/her/hers)

Resident Physician
Flushing Hospital Medical Center, Department of Obstetrics and Gynecology
Long Island, NY, United States

Coauthor(s)

David Garry, DO

Maternal Fetal Medicine
Stony Brook Medicine
Stony Brook, NY, United States
IN

Ivan Ngai, MD

Flushing Hospital Medical Center
Flushing, NY, United States

Objective: Fetal growth and development depends on the delivery of nutrients by the placenta from the mother to the fetus. Accordingly, the size of the umbilical cord has the potential to predict fetal outcomes. We sought to evaluate the association between umbilical cord diameter and birth weight.

Study Design: A free floating umbilical cord cross-section was evaluated in all patients from June 2021 to June 2022 during the standard second trimester anatomy ultrasound. The entire umbilical cord diameter, individual umbilical arteries and vein diameters were measured in the sagittal view. Only patients who delivered a live infant and had a fetal anatomy ultrasound performed at our institution were included. Patients with two vessel cords, fetal demise, aneuploidy and twin gestations were excluded. Demographic and clinical data were extracted from the electronic medical records. Umbilical vessel diameters to newborn birth weight were compared using linear regression. Statistical significance was set at p < 0.05.

Results: During the study period, 1043 patients with a second trimester anatomy ultrasound performed between 18-22 weeks (Mean: 21.4; SD: +2.11) were evaluated with 410 patients having the umbilical vessels measured and met inclusion criteria. There was a positive correlation between umbilical cord diameter and birth weight (r-value: 0.118, p-value 0.01). Figure 1. In the linear regression model, umbilical cord diameter was a significant independent predictor of newborn birth weight (β=225.3; p=0.023). Individual cord vessels, umbilical vein diameter (r-value: 0.10; p-value 0.05), and umbilical artery (r-value: 0.02, p-value 0.73) did not correlate with birth weight.

Conclusion: There is a significant positive correlation between umbilical cord diameter and birth weight, and a potential for a second trimester variable to predict newborn birth weight.