Mine came in at 1/37 for DS - due to age (41) and a 4.2 nuchal fold measurement. At my age the risk factor was something like 1/45 anyway so it didn't alter it much. Can't remember what the one for all the other chromosonal stuff was but it was in the thousands - way better than the average for my age. I had an amnio and no abnormalities were found. Everything they check at around 22 weeks was normal and in fact growthwise he's 5 days ahead of schedule.
Not sure how high it goes up to but anything under 1/300 is considered high risk and further investigations should be carried out.




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