With the rapid development of medical technology, many advanced examination items are applied to check whether the fetus has any problems. The Down syndrome ultrasound screening is such a test, and when people do this test, they find that there is NF on the test list, which many people do not understand. They want to know what Down syndrome B-ultrasound screening for NF is?
One indicator for pregnant women during prenatal ultrasound examination is NF, which refers to the skin condition behind the fetal neck and the thickness of soft tissue. Generally, in order to exclude children with Down syndrome, it is recommended that pregnant women undergo Down syndrome screening, which only requires the blood of the pregnant woman to be drawn. Amniotic fluid aspiration and umbilical cord blood draw are only performed in high-risk situations.
NF is an auxiliary test of Down syndrome examination, usually performed at 11-13 weeks of pregnancy. The examination method is to extract the serum of pregnant women, check the concentration of chorionic gonadotropin and alpha fetoprotein in the mother's body, and calculate the risk factor of Down syndrome.
The Nf test has been widely used in screening fetal chromosomes. The main focus of the examination is the nuchal translucency. Usually around 14 weeks, the fetal jugular sinus is connected to the left and right lymphatic vessels, causing the translucency to gradually thin until it disappears. If there is an error in the abdominal examination, vaginal ultrasound measurement can also be performed instead.
Due to the high operational requirements of NF examination, it is recommended that pregnant women go to a regular hospital for this examination so that professional personnel can accurately measure this value and avoid errors.
