The statement that nine out of ten Downscreens are high risk is false and has no scientific basis. Down’s syndrome screening refers to the screening of the fetus during pregnancy, through ultrasound and blood tests to determine the degree of risk, the accuracy of the test is slightly lower than the amniocentesis or non-invasive DNA test, but the error is smaller, if there is a high-risk situation, it should be timely to improve the amniocentesis or non-invasive DNA test to further clarify the presence of chromosomal abnormalities. High-risk groups of Down’s syndrome screening are usually found in older mothers than 35 years old. If the non-invasive DNA or amniocentesis test is positive, it is highly suspected that the fetus is suffering from Down’s syndrome, which can cause mental retardation and growth retardation in infants, and it is recommended to terminate the pregnancy.