Patient's question:
But for 21PS+, the doctor said 98% of it is genetic. Since both of us are fine physically, the child will be fine.Doctor's answer:
Analysis of the condition: Amniocentesis is a method of prenatal diagnosis. It is generally suitable for prenatal diagnosis during the second trimester of pregnancy. Amniotic fluid exists in the amniotic cavity; the amniotic cavity is formed by the fertilized egg on the seventh day of fertilization, and it begins to produce amniotic fluid. At 12 weeks of pregnancy, the volume of amniotic fluid is 50 milliliters, at 20 weeks it is 400 milliliters, and at 36-38 weeks it is 1000-1500 milliliters. The volume of amniotic fluid slightly decreases as the due date approaches.Recommendations: The best time to perform amniocentesis for prenatal diagnosis is between 16 and 24 weeks of pregnancy. This is because the fetus is small at this stage, and there is relatively more amniotic fluid. The fetus floats in the amniotic fluid, surrounded by a wide band of amniotic fluid. When using a needle to extract amniotic fluid, it is less likely to injure the fetus. Extracting 20 milliliters of amniotic fluid only accounts for 1/20 to 1/12 of the total volume, which will not cause the uterus to suddenly shrink and lead to miscarriage. Additionally, this period has the highest proportion of viable cells in the amniotic fluid, with high cell culture survival rates. These cells can be used for slide preparation, staining, and fetal chromosome karyotype analysis, chromosome genetic disease diagnosis, and gender determination. Amniotic fluid cells can also be used for DNA-based genetic disease diagnosis and metabolic disease diagnosis. Measuring alpha-fetoprotein in the amniotic fluid can also diagnose fetal open neural tube defects, among other conditions.