First trimester dating ultrasound

Your technician should be schooled in obstetrical ultrasound, preferably at a center accredited by the American Institute of Ultrasound in Medicine.Experts discourage getting 3-D and 4-D (moving picture) ultrasounds at fetal portrait studios in places like shopping malls, where untrained personnel may give out inaccurate information.

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First trimester dating ultrasound

(Don't worry: This occurs only 1 percent of the time.) And your doctor will also be able to tell if you're pregnant with multiples.

Other tests All pregnant women are offered a nuchal translucency (NT) test, performed between 11 and 13 weeks, and this involves another ultrasound.

From this test, your doctor will be able to determine a more accurate due date and track milestones during your pregnancy.

Your ob-gyn will also rule out a tubal (ectopic) pregnancy, which is when the fetus grows in the fallopian tube instead of the uterus.

These sound waves send signals back to a machine that converts them into images of your baby.

The standard ultrasound arms your doctor with valuable information.

And you're due for a detailed ultrasound, generally between weeks 18 to 20 of pregnancy, which will give you a good, long look at your baby.

What to expect at your exam This ultrasound, called an anatomy scan, lasts 20 to 45 minutes if you're having one baby, longer if you're having multiples.

The NT evaluates your risk of having a baby with Down syndrome, trisomy 18 (another chromosomal abnormality), or certain heart defects.

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