Predicting Fetal Age and Weight

  • Fetal weight is notoriously difficult to predict.
  • Fundal height is measured from the height of the top of the uterus to the pubic symphysis, and the height in cm is approximately equal to the number of weeks. The accuracy drops toward the end of the pregnancy as the fetus “drops” and enters the pelvis. Accuracy is also reduced in obese mothers.
  • Ultrasound is very accurate in the first and second trimesters, but drops to about 65% as term approaches.

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