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A Level 3 Ultrasound uses a very expensive machine that is capable of picking up very slight changes and abnormalities in the fetus that cannot be detected on lesser machines. The reason they reccommend them for women after age 35 is that the risk of having a child with Down's Syndrome and/or other Chromosomal Abnormalities goes up with age. The risk of having a child with Dowm's Syndrome at age 20 is approx. 1/1667, the risk of any Chromosomal Abnormality is 1/526. At age 35 the risk of Down's Syndrome goes up to approx. 1/385, and the risk of any Chromosomal Abnormality is 1/192. If certain indicators are found on the ultasound then they would most likely suggest you have an amniocentesis to test the chromosomes of the fetus. Elevated Alpha-fetoprotein levels in the mothers blood can also be used to help detect certain problem in the fetus, this is usually done between 16 and 18 weeks, combined with HCG levels and serum Estriol levels. These three markers can be used to calculate your risk of having a fetus with abnormalities.

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Q: What is a level 3 ultrasound and why are they needed after age 35?
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