Fundal Height Discrepancy: Understanding Uterine Measurements During Pregnancy

Question
I'm 21 have 3 kids and currently pregnant with my 4th. My LMP was nov 14th,2005. I was wondering what would cause my fundus to measure 4 weeks further along then what I am? I had an ultrasound and the baby is the right size and my glucose test was normal

Answer
Measuring the fundus of the uterus is purely subjective. One practitioner may get one measurement and another may get a different measurement. If the sonogram shows that the baby is adequate for dates, don't worry about it.  Size may be due to a large baby, you may be carrying "high", you may be obese. The time to test your glucose is at 28 weeks gestation.