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The level II ultrasound measures the size of the fetus and evaluates your baby’s major organs as well as the amount of amniotic fluid, the length of your cervix and the location of the placenta. The fetal position, fetal size, and maternal weight may limit the accuracy of ultrasound.

Can ultrasound detect chromosomal conditions?

Ultrasound is not considered a good screening test for Down syndrome. Ultrasound at 20 weeks of pregnancy will identify approximately 50% of fetuses with Down syndrome and 95% of cases of trisomy 18. Not all babies with a chromosome abnormality will have an abnormal ultrasound finding.

What if the ultrasound identifies a problem?

If any concerns are raised by the ultrasound, the provider will discuss the option of additional testing with you.

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