High risk of trisomy 18 may indicate that the fetus has a higher risk of chromosome 18 abnormality and may suffer from trisomy 18 syndrome, but this is not always the case. Patients are advised to go to the hospital for further examination and can undergo amniocentesis and non-invasive DNA testing to determine the development of the child with an accuracy rate of 99%. Amniocentesis: Under the guidance of B-ultrasound, a professional physician will use a special long needle to extract amniotic fluid through the uterine wall of the pregnant woman for related examination. Amniocentesis is an invasive operation. After the procedure, it is necessary to take proper rest and observe whether there are contractions, as well as bleeding and flowing water to avoid infection. 2. Non-invasive DNA testing: The doctor takes the blood of the pregnant woman and looks for fetal cells through her blood to detect chromosomal genes in the fetal cells to see if there are any abnormalities. Treatment measures If the fetal chromosomal abnormalities are ruled out through the above tests, continue to pay attention to pregnancy maintenance and regular maternity checkups. If it is determined to be trisomy 18, it is recommended to induce labor, because the affected children have low life skills and even with careful care, they mostly die within the first 2 months of life, and very few of them live to 1 year old, and most of them have severe mental retardation. Precautions 1, regular maternity checkups during pregnancy to keep track of the physical condition of the fetus and the pregnant woman; 2, pay attention to rest and strengthen diet and nutrition; 3, pregnant women should not use drugs indiscriminately and should not be exposed to environments with clear radiation, such as unnecessary medical examinations.