A problematic placenta is not necessarily a high risk for a non-invasive DNA test because a problematic placenta does not lead to chromosomal abnormalities in the fetus. When a woman discovers that there is a problem with the placenta during pregnancy, it may refer to a racket placenta or a sail placenta, a low lying placenta, etc. This refers to an abnormal position of the placenta, or an abnormal position of the umbilical cord attached to the placenta. This condition does not cause chromosomal abnormalities in the fetus, so it will not affect the results of the non-invasive DNA test. If the non-invasive DNA test has a high risk, it may not have anything to do with the placenta and may be a chromosomal abnormality disorder such as 21-trisomy, 18-trisomy, or 13-trisomy. Non-invasive DNA testing with high risk suggests prenatal diagnosis, which means amniocentesis or cord blood puncture. If it is determined that the fetus has a chromosomal abnormality, early termination of pregnancy is required.