My friends baby tested positive for down syndrome in one of the early screenings. They suggested termination. When my friend asked what the chances were they said on that test they had a 1 in 100 chance of down syndrome.

That baby did not have down syndrome and is now a happy seven year old.

We were given 1 in 21 from the nuchal transparency on the 12 week scan, then we did CVS testing to find out for sure.

Terminating on 1/100 without any further testing seems crazy to me. Of course, our scans and screening were all 'free' on the NHS, so there was no cost to getting extra data.

How early was this screening? I've not heard of a 1 in 100 chance, and I really struggle to believe medical practitioners would be suggesting termination. I suspect something was lost in translation when you were told the story.

Wait, am I reading this wrong or did they suggest abortion to avoid a mere 1% risk of Down syndrome?

What is your point, that variance exists? I'm not sure I'd play Russian roulette even with a 100 chamber cylinder. 99 people might come away with an anecdote though.