Midterm Down’s screening is performed between 15 and 20+6 weeks, with the optimal time frame recommended to be between 16 and 18 weeks of pregnancy.
Down’s screening tests the fetus for risk of trisomy 21, trisomy 18 and open neural tube malformation. Generally pregnant women should undergo midterm Down’s screening at 15-20+6 weeks. If the screening result is high risk or critical risk, non-invasive DNA test or amniocentesis is needed to further clarify whether the fetus has chromosomal abnormalities.
The optimal gestational week to choose is 16-18 weeks of pregnancy for mid-term Down’s screening, if the result is abnormal, then non-invasive DNA test or amniocentesis, if labor needs to be induced, the gestational week is not too large, which is conducive to the mother’s recovery.
When is the best time to do mid-term Down’s syndrome screening, it is recommended to go to the hospital by the doctor combined with the pregnant woman’s menstrual history and ultrasound comprehensive judgment, to choose an optimal pregnancy week.