First trimester dating ultrasound

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If the ultrasound date is within seven days of your LMP date, we would stick with your LMP date.

Ultrasounds done later in the pregnancy are less accurate for dating, so if your due date is set in the first trimester, it shouldn't be changed.

Early in pregnancy, ultrasounds are used to confirm the fetal heartbeat and a uterine (as opposed to ectopic or tubular) pregnancy.It's generally done by a trained sonographer in a hospital or specialized clinic, where the equipment is more sophisticated.The second trimester ultrasound is not only fun for you to watch, it gives you and your practitioner a clear picture of the overall health of your baby and your pregnancy.Later, ultrasounds screen for fetal growth, placenta location and umbilical cord, as well as the baby's general health and anatomy.Ultrasounds can also be useful for checking the length of your cervix, if there is any suspicion that you may be in preterm labor.

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