The probability of having a problem with a high-risk fetus with chromosome 18 cannot be determined, and there is no accurate clinical value. Generally, if chromosome 18 is found to be high risk during the chromosome 18 test, this condition may have chromosomal disorders, so it is best to seek medical attention in time for non-invasive DNA test or amniocentesis, through which the specific condition of the fetus can be determined. If the non-invasive DNA test or amniocentesis test is determined to be high risk, this situation indicates that the possibility of chromosomal abnormalities is very high, and at this time, the pregnancy can be terminated in a timely manner, but it is not possible to determine the probability of the occurrence of the disease simply through a test. Pregnant women should pay attention to the prenatal examination during pregnancy, actively listen to the advice of professional doctors to do a comprehensive nursing care, pay attention to rest, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.