When is Down syndrome screening done?

Patient's question:

I want to ask if my Down syndrome screening cannot be done by the 19th Saturday, as the doctor said the testing period is from the 15th Friday to the 19th Friday, and I have passed the testing time. I am very worried because I heard that the Down syndrome screening is very important. Is there any way to make up for it? What aspects of the fetus does this main test check? What are the necessary tests to be done later? Can the systematic ultrasound check if the fetus has deformities and if its intelligence is normal? A few days ago, when I went for a check-up, the doctor said I was deficient in zinc and iron and prescribed Gancao Zinc Granules and Succinate Iron Tablets. How long should I take this medication?

Doctor's answer:

Analysis of the condition: Hello! Don't worry too much. You can do an ultrasound examination in about a month. It's for 3D fetal anomaly screening.
Advice: Hello! Prenatal screening, such as the Down syndrome screening, can only relatively sensitively assess the risk of chromosomal abnormalities but cannot evaluate the child's intelligence. Currently, there is no test that can evaluate a child's intelligence. It is recommended that you do a 3D fetal anomaly screening in about 24 weeks of pregnancy, which is about a month from now. This can provide a more detailed examination of the child's development, including whether there are any abnormalities in the organs. This is very important, so don't miss it. As for calcium, iron, and zinc, it is recommended that you take them for a month first and then check in the next examination to see if they have returned to normal. If they haven't returned to normal, you may need to continue or adjust the dosage. If they are normal, then it's okay. Wishing you and your baby a safe and healthy pregnancy!
Doctor's inquiry: Have you done a fetal ultrasound anomaly screening?

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