For Down’s syndrome screening alone, the results are generally accurate. However, since it is a screening test, it is only a screening method and not a method of confirming the diagnosis. The results of the test can only provide a possibility, a probability, and cannot be used as a basis for a direct diagnosis. Moreover, the accuracy of the Down’s syndrome screening results is directly related to the information provided by the pregnant woman, such as the week of pregnancy, age and weight. Pregnant women who are found to have abnormal results after screening for Down’s syndrome will require further DNA testing to make a definitive diagnosis. The result of Down’s syndrome screening is normal if it is low risk, which means that the risk of the fetus having Down’s syndrome is relatively low and no further testing is needed.