Bartholomew's rule

determining the age of gestation by assessing the level of the fundus.

3 landmarks to remember:

symphisis pubis

umbilicus

xiphoid process

when the fundus is palpable at the level of the:

symphisis pubis- 12 weeks

umbilicus- 20 weeks

xiphoid- 36 weeks

midway between umbilicus and symphisis pubis- 16 weeks

on the 38th to 40th week lightening will occur so the fundus will be below the xiphoid process