21-trisomy syndrome

Patient's question:

21-Three-body syndrome 1/180 high risk

Doctor's answer:

Analysis of the condition: Amniocentesis test to rule out Down syndrome (21-trisomy syndrome). Before the procedure, a blood test must be conducted, and only if it meets the criteria can the specific time for the amniocentesis be scheduled. The risk of miscarriage is less than 1%, and it is almost painless.
Recommendations: Amniocentesis involves extracting amniotic fluid to culture fetal cells that have fallen into the fluid, and then testing the cells for chromosomes (specifically the 21 chromosome of the fetus). 20ml of amniotic fluid is collected. The potential risks include infection, amniotic fluid leakage, and miscarriage (risk of 1%). The success rate of culturing fetal cells in the amniotic fluid is 98%. The accuracy rate of testing the cell chromosomes (the fetus's 21 chromosome) is 100%. The only medical method to determine if the fetus has 21-trisomy is through amniocentesis.
Doctor's inquiry: