Patient's question:
A 6-month-old baby cannot lift their head, can roll over, and has a normal appetite, with no significant abnormalities, but sometimes they shake. What is the critical value for fetal Down syndrome?Doctor's answer:
Down syndrome screening low-risk value is 1/270 or less. The critical risk is between 1/270 and 1/1000. The detection rate of Down syndrome screening is 60-70%, with a false-positive rate of over 5%. Critical risk requires further confirmation through non-invasive DNA screening or amniocentesis. The detection rate of non-invasive DNA is 99.9%, and the detection rate of amniocentesis is 99.9%. These are all critical values for Down syndrome.