Obstetric ultrasound uses sound waves to produce pictures of a baby (embryo or fetus) within a pregnant woman, as well as the mothers uterus and ovaries. It does not use ionizing radiation, has no known harmful effects, and is the preferred method for monitoring pregnant women and their unborn babies.
What is obstetric ultrasound used for?
Obstetric ultrasound provides pictures of an embryo or fetus inside your uterus, as well as of your uterus and ovaries – so its a valuable tool for monitoring your pregnancy and unborn baby.
How accurate is obstetric scan?
The earlier the ultrasound is done, the more accurate it is at estimating the babys due date. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy. The most accurate time is between 8 and 11 weeks gestation.
How do I prepare for an obstetric ultrasound?
Empty your bladder 90 minutes before exam time, then consume one 8-ounce glasses of fluid (water, milk, coffee, etc.) about an hour before exam time. We recommend a two-piece outfit so we can access your abdomen without you removing your clothing. You may eat normally prior to having a fetal ultrasound.
When do you find out gender?
Most doctors schedule an ultrasound at around 18 to 21 weeks, but the sex may be determined by ultrasound as early as 14 weeks . Its not always 100 percent accurate, though. Your baby might be in an awkward position, which makes it difficult to clearly see the genitals.