Non-invasive DNA testing includes non-invasive DNA ordinary version (i.e. non-invasive DNA three) and enhanced version (i.e. non-invasive DNA full set), the difference mainly lies in the different content of the test items and price difference: 1. Test item content: non-invasive DNA ordinary version detects the presence of three chromosomes abnormalities, including chromosome 21 trisomy, chromosome 18 trisomy and chromosome 13 trisomy, these three chromosomes These three chromosome tests are the most basic tests of non-invasive DNA. In addition to the above three tests, it can also check other common chromosomal diseases and microdeletion and microrepeat syndromes, etc. There are more testing items. 2. If a pregnant woman’s non-invasive DNA test indicates a critical risk or high risk, it is recommended to follow the doctor’s advice to have an enhanced version or amniocentesis to clarify whether there are abnormalities in fetal development and avoid the birth of defective children.