Clinical Palpation for Estimating Fetal Weight

Introduction to Clinical Palpation

• The American College of Obstetricians and Gynecologists (ACOG) guidelines state that clinical palpation (Leopold's maneuvers) has an accuracy equivalent to ultrasound biometry for suspected fetal macrosomia, with a strength of evidence based on comparative studies 1

Assessment Techniques

• Assessment of fundal height from the pubic symphysis to the top of the uterine fundus correlates with gestational age, with measurement in centimeters approximately equaling gestational age in weeks between 18-32 weeks, according to clinical guidelines 2

Clinical Limitations and When to Use Ultrasound

• In cases of maternal obesity, uterine fibroids, or when fundal height lags behind expected gestational age, ultrasound should be used instead of clinical palpation due to its higher accuracy, as recommended by clinical guidelines 2
• Ultrasound evaluation should also be performed in cases of polyhydramnios or oligohydramnios, as abnormal amniotic fluid volumes can interfere with palpation accuracy, according to clinical guidelines 2

Importance of Accurate Pregnancy Dating

• Accurate pregnancy dating using first-trimester crown-rump length is crucial before interpreting any fetal weight assessment, as misdating can lead to misclassification, as emphasized by clinical guidelines 3

Serial Measurements and Growth Tracking

• Serial measurements tracking growth trajectory are more valuable than single measurements, and should be plotted on customized growth charts to track trajectory, as recommended by clinical guidelines 2