Research shows that routine obstetric ultrasound before 24 weeks gestational age can significantly reduce the risk of failing to recognize multiple gestations and can improve pregnancy dating to reduce the risk of labor induction for post-dates pregnancy.
There is no difference, however, in perinatal death or poor outcomes for babies.
When I se my ob in a few weeks I'll see what she thinks about officially changing my due date.
From what I've heard,most often lmp is used because most don't know the date of conception but lmp is not as accurate.
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The accurate determination of a patient's "due" date, referred to by doctors and midwives as the EDC (Estimated Date of Confinement) or EDD (Estimated Date of Delivery), is very important for a variety of reasons.
The American College of Obstetricians and Gynecologists state the following: “Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks gestation) is the most accurate method to establish or confirm gestational age” (Committee Opinion, No. Even though using your last period date (LMP) is a traditional dating method, the accuracy of this practice depends on a regular menstrual cycle of 28 days, with ovulation occurring on the 14th day of the cycle.
Even when LMP is known, studies have shown that 40% of women have their due dates altered by more than 5 days after dating by ultrasound (American Journal of Obstetrics and Gynecology, 2004).
**The Pregnancy Resource Center offers free ultrasounds to determine how far along you are in your pregnancy and to see if your pregnancy is viable.
LMP is only used until the dating scan as it's the best guess until they measure the baby.
The scan measurements are supposed to be accurate to within a couple of days.