Biotechnology
A tube of blood can flag a chromosome problem in a fetus or a tumour nobody has found. It works by counting fragments of dead cells
23 Sept 2026 · 8 min read
Your plasma carries short scraps of DNA shed by cells as they die — including, in pregnancy, the placenta's, and in cancer, the tumour's. The tests built on this do not read a genome. They detect a statistical excess in a mixture, and every limitation follows from that.
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