Down’s syndrome is a screening test for Down’s syndrome, NT, four-dimensional normal, Down’s syndrome critical risk may not be a problem, but it is not absolute, and does not exclude the possibility of chromosomal abnormalities, the need for further amniocentesis or non-invasive DNA examination to determine.
NT, four-dimensional ultrasound examination is through the abdominal ultrasound to measure the thickness of the fetal nuchal translucent layer, dynamic observation of fetal organ structure development, this aspect of the examination is normal, indicating that fetal chromosomal abnormality is less likely to be abnormal, limbs and internal organs developmental deformities of the chances are also relatively small, but some of the subtle examination is not detected.
The Down’s syndrome test is to detect the concentration of alpha-fetoprotein and human chorionic gonadotropin in the pregnant woman’s blood, combined with the effects of age, gestational week, medication and other factors, to assess the chances of Down’s syndrome, the critical risk is defined as between high risk and low risk, and further non-invasive DNA and amniocentesis tests need to be done, to determine whether there are any abnormalities in the fetus will be more accurate.
Pregnancy should be done at all times of pregnancy labor and delivery, and any abnormalities should be dealt with in a timely manner.