The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
the majority of the cell-free DNA belongs to the mother and because the fetal placental self-free DNA is a trivial amount even though by definition a triom means there is 50% more of one chromosome you've gone from two to three copies in the fully diluted sample that might only translate to a few percent but that's enough given the large numbers that you're testing to be a definitive statistically significant difference that triggers a positive test
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
what you expect you know if if every tissue in is is um has an even chromosome distribution you know or two chromosomes is that that profile would be flat and each bucket would be about the same level um but what you see in um a woman carrying a a fetus that has a triom you'll see you'll see 50% greater in the chromosome 21 bucket yeah yeah you you actually see more like five or 10% because again remember 90% of it might be maternal blood right so that's all going to be even but within the 10% fetal right that's going to be um you're G to have an extra 50% so so the total might be exra 5% whatever 10%