There are many examination items during pregnancy, and many pregnant women do not know much about them. In fact, although there are many examination items, for most pregnant women, there are only about ten types that must be done. The rest can be done or not, and some examinations are only done when necessary. Under what circumstances is amniocentesis necessary for pregnancy testing?
Generally, amniocentesis may be required during the Down syndrome screening process, and amniocentesis is an important examination item in Down syndrome screening. Because amniocentesis carries certain risks, it is generally performed through preliminary screening. In cases where the risk of screening is low, amniocentesis is not mandatory. It is only necessary to perform amniocentesis to confirm the condition of the fetus when the risk of screening is high.
The best time for amniocentesis is between 17-21 weeks of pregnancy. At this time, the amount of amniotic fluid is relatively large and the fetus is small. When using a needle puncture to extract amniotic fluid, it is not easy to injure the fetus, and extracting 20-30 milliliters of amniotic fluid will not have adverse effects on fetal development. The most important thing is that there are many live cells in the amniotic fluid during this period, and the success rate of cell culture is high.
Of course, the specific time for amniocentesis still needs to follow the doctor's advice. Pregnant women only need to go to the hospital for prenatal check ups every month. During the ultrasound examination process, the doctor will advise women when to do it, as long as they follow the doctor's advice.
