Prenatal Surveillance for Hypocoiled Umbilical Cord

Initial Assessment and Risk Stratification

The American College of Obstetricians and Gynecologists recommends initiating serial growth assessments and umbilical artery Doppler surveillance when a hypocoiled umbilical cord is identified during the second-trimester anatomic survey, as hypocoiling is strongly associated with fetal growth restriction, preterm delivery, and adverse perinatal outcomes 1

The American College of Obstetricians and Gynecologists suggests weekly umbilical artery Doppler evaluation should be initiated once fetal growth restriction is suspected or confirmed, as this is the only surveillance modality with Level I evidence for reducing perinatal mortality 2, 3
The frequency of Doppler assessment should be adjusted based on findings, with normal forward end-diastolic flow requiring weekly Doppler assessment 2, 3
Decreased diastolic flow should prompt continuation of weekly Doppler with plan for delivery at 37 weeks 1, 4
Absent end-diastolic velocity (AEDV) requires increased surveillance to 2-3 times per week due to risk of rapid deterioration, with delivery planned at 33-34 weeks 2, 3, 4
Reversed end-diastolic velocity (REDV) necessitates hospitalization with cardiotocography at least 1-2 times daily, delivery at 30-32 weeks 1, 4

The American College of Obstetricians and Gynecologists recommends beginning weekly antenatal fetal surveillance at 36 weeks for isolated hypocoiled cord without growth restriction 1
Twice-weekly nonstress testing with weekly amniotic fluid evaluation should be initiated if growth restriction develops, or perform weekly biophysical profile testing 2, 3

Delivery at 38-39 weeks is recommended for normal umbilical artery Doppler with estimated fetal weight (EFW) 3rd-10th percentile 1, 4
Decreased diastolic flow or severe fetal growth restriction (EFW <3rd percentile) requires delivery at 37 weeks 1, 4
Absent end-diastolic velocity necessitates delivery at 33-34 weeks with antenatal corticosteroids 1, 4
Reversed end-diastolic velocity requires delivery at 30-32 weeks with hospitalization, corticosteroids, and consideration of cesarean delivery 1, 4

The American Academy of Pediatrics recommends notifying the pediatric team of the prenatal findings at delivery, as structural anomalies have been revealed in up to 7% of infants with prenatal cord abnormalities 1