Third-Trimester Ultrasounds: Does Everyone Need Them?

Detection of abnormalities of fetal growth or amniotic fluid was more likely in women who underwent serial third-trimester sonography; but this difference needs further interpretation.

Abnormalities of fetal growth (small or large for gestational age [SGA, LGA]) and amniotic fluid are not uncommon, yet our primary screening modality— serially assessing fundal height— may seem inexact compared with ultrasound imaging. In a randomized trial, investigators evaluated serial ultrasound examinations every 4 weeks in the third trimester versus routine care (fundal height measurement and ultrasound imaging only when clinically indicated) in 206 low-risk women.

The composite outcome of abnormal fetal growth and amniotic fluid occurred in 27% of the serial ultrasound group (mean number of examinations per woman, 3) and 8% of the routine care group (relative risk, 3.4). This difference appeared to be driven by detection of polyhydram…

Reviewing Author

Allison Bryant, MD, MPH

Disclosures

RoyaltiesUpToDate

Leadership Positions in Professional SocietiesSociety for Maternal-Fetal Medicine (Board of Directors)

Allison Bryant, MD, MPH

Disclosures

RoyaltiesUpToDate

Leadership Positions in Professional SocietiesSociety for Maternal-Fetal Medicine (Board of Directors)

Third-Trimester Ultrasounds: Does Everyone Need Them?

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Reviewing Author