During the pregnancy, your baby’s DNA circulates freely in your bloodstream. This allows the mother to perform prenatal tests to rule out the possibility of trisomies.
Trisomies occur when during the formation of the baby, some pair of her chromosomes instead of being two are three. This gives way to syndromes such as Down, Edwards, Patau, etc. This test is 0% risky for your baby, unlike amniocentesis.
Source
https://medlineplus.gov/lab-tests/prenatal-cell-free-dna-screening/
Clément Destoumieux
PRESENT: + 20 years in complex legal and IT projects in France, the UK and Spain Expert in BioExpert exclusive network of experts in the sectors of life science and investment. Startups coordinator of ANIS (Spanish Association of Health Journalists) Lider ehealth in Asociación Española de Start up Active member of ASEBIO (Leading Spanish Biotech Association) PAST: Sociedad Española Informática de la Salud MBA in Ecole Des Mines – Nantes Master Degree in Ipag Business School in Paris