What the anatomic landmarks for estimation of gestational age based on fundal height measurements?
Measuring fundal height is a skill PA students must acquire on their OBGYN rotation. Using a rolled tape measure, the distance is measured (in cm) from the pubic symphasis to the highest part of the uterus. Note that it may not be mid-line and you will need to do some palpation to find the apex.
Anatomic landmarks can help estimate gestational age based on fundal height measurements:
- 12 weeks – just above the pubic symphasis
- 16 weeks – halfway between pubic symphasis and umbilicus
- 20 weeks – at the level of the umbilicus
After 20 weeks, gestational age is estimated at 1 cm per week…..that is to say 25 weeks gestational should have a fundal height measurement of 25 cm (+/- 2 cm).