Down's statistics question

excited16

I've been trying to find info about what exactly the statistics for Trisomy 21 (downs) mean.  I've found quite a bit of conflicting information.  For example at age 40 does the 1/100 statistic mean the chance of conceiving an embryo with Down's (though many will miscarry early) or does the statistic mean those that are carried to term +/- those who choose to terminate the pregnancy...

Confusing. 

mpstochlinski8

I'm not sure I'm really able to answer that for you but for what we did was get a general risk for my age then after the NTscan and bloodwork with u/s they called me a couple of days later with my personal risk #s. Have you had an NTscan or another type of risk screening? I think the #s they generally give you are usually much riskier than it seems once they test you as an individual. As they put it to me, my risk for downs was 1 in 55,774 she told me that of that # of people who had a baby 1 had downs so I think its not the # of m/c but the # of babies born in that ratio. 

alliapistor

The age-based risk information I've seen refers to chance of "conceiving" a child born with DS.  And then there are different numbers on the % conceived who survive past birth.

I'm not sure how they collect the data for number "conceived" v. number delivered though because many miscarriages happen early and no testing is done to determine the cause.

Jennairess

not sure the answer to this and if the ratios are different for each state, hospital etc....I can tell you im 38 and my risk before the NT scan was 1:48 after my NT scan it went to 1:140....because I was still under the 1:200 that my doctors office requres i was sent to the genetic folks and ended up having the amnio....everything was fine from the amnio.