1/325: Approximately 1 in every 325 pregnancies in a 34 year old woman will have downs syndrome.
Answered 4/13/2013
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About 1/400 at 35: The risk increases each year as you get older. At age 45 the risk is about 1/35 for example. But remember, that also means a 34/35 (or 97%) chance the baby wouldn't have ds.
Answered 4/13/2013
5.2k views
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