Non-invasive full name is non-invasive DNA prenatal testing, need to pay attention to the time of the test, the test mode and nature and so on. 1. Test time: non-invasive test has time requirements, not the whole pregnancy can be done, it is recommended to carry out the test between 12-24 weeks of pregnancy. 2. Method of examination: Non-invasive examination is carried out through blood sampling, by taking peripheral blood of the mother, but does not require fasting, and the time can be in the morning or afternoon. 3. Nature of the test: The test is a screening test, not a diagnostic test. If there is a problem with the report, other tests, such as amniocentesis, are needed to confirm the diagnosis. The main purpose of the non-invasive test is to screen the fetus for chromosomal abnormalities, and if problems are found, follow the doctor’s advice to see if the pregnancy can continue.