Fundal Height Measurement Guidelines

Introduction to Fundal Height Measurement

International guidelines, including those from the American College of Obstetricians and Gynecologists, universally recommend measuring fundal height with a tape measure in the third trimester as a screening tool for fetal growth abnormalities, with the measurement in centimeters correlating to gestational age in weeks between 18-32 weeks 1, 2

The American College of Obstetricians and Gynecologists recommends that fundal height should be measured from the pubic symphysis to the top of the uterine fundus using a tape measure, with the measurement in centimeters approximately equaling gestational age in weeks 2

At 36 weeks, the fundus reaches the xiphoid process, as noted by the American College of Obstetricians and Gynecologists 3

The American College of Obstetricians and Gynecologists recommends plotting fundal height measurements on customized growth charts, which account for maternal characteristics and have been associated with improved detection of small-for-gestational-age babies and reduction in stillbirth 1, 2, 5, 6
The American College of Obstetricians and Gynecologists defines suboptimal growth when fundal height is >3 cm less than gestational age in weeks, according to the McDonald rule 2, 4

The American College of Obstetricians and Gynecologists recommends ultrasound scans instead of fundal height in women with obesity and/or fibroids, as fundal height measurements are unreliable in these populations 3, 4, 5

The American College of Radiology recommends that when fundal height measurement lags >2-3 cm behind expected gestational age, ultrasound evaluation for fetal growth restriction should be performed 7
The American College of Obstetricians and Gynecologists recommends umbilical artery Doppler studies when small-for-gestational-age is suspected based on fundal height discrepancy, as this guides surveillance frequency and delivery timing 1, 4
The American College of Radiology recommends that serial fundal height measurements showing inadequate growth velocity warrant ultrasound evaluation even if absolute measurements remain within normal range 7

The American College of Obstetricians and Gynecologists advises against relying on fundal height alone in obese patients, where sensitivity drops significantly, and recommends proceeding directly to ultrasound in these cases 3, 5
The American College of Obstetricians and Gynecologists recommends plotting serial measurements on a chart, as single measurements are less useful than tracking growth trajectory over time 2
The American College of Obstetricians and Gynecologists advises against using outdated population charts from the 1980s that may not reflect current maternal weights and body habitus 3, 5