What is Non-invasive DNA Amniocentesis?

Non-invasive DNA testing and amniocentesis are common examination methods after pregnancy for a period of time. The main purpose is to check whether the fetus has congenital chromosomal abnormalities, such as Down syndrome, etc., but the two examination methods are different. Non-invasive DNA is to extract pregnant women's blood and separate fetal DNA fragments from it for observation, while amniocentesis is to directly take amniotic fluid for examination.