Height of the uterine fundus. This is a rough estimate of the size of the fetus and is used to screen for problems with fetal growth. This is a basic statistic that will be measured at most prenatal visits. The fundal height (in centimeters) is measured with a tape measure from the top of the pubic bone to the top (fundus) of the uterus. The fundal height increases as the uterus enlarges and between 18 and 30 weeks of gestation, the fundal height in centimeters coincides with the weeks of gestation.