Non-invasive DNA is mainly used to check the risk rate of a fetus with 21-trisomy, 18-trisomy, and 13-trisomy disorders. However, sometimes it can also test for sex chromosomes, other chromosomes as well as some chromosomal microdeletion and microduplication syndromes, and testing for certain genetic abnormalities. Non-invasive DNA tests include Non-invasive DNA Regular (i.e. Non-invasive DNA Three) and Enhanced (i.e. Non-invasive DNA Complete). The non-invasive DNA general version, mainly checks the risk rate of a fetus with 21-trisomy syndrome, 18-trisomy syndrome, and 13-trisomy syndrome disorders. Non-invasive DNA Enhanced Version, in addition to the three tests in Non-invasive DNA Regular Version, can also check for other chromosomes as well as some chromosomal microdeletion and microduplication syndromes, and testing for certain genetic abnormalities. If the Non-invasive DNA General test indicates a critical risk or high risk, it is recommended to follow the doctor’s advice to carry out Non-invasive DNA Plus or amniocentesis to clarify whether there is any abnormality in the development of the fetus and to avoid the birth of defective children.