Patient's question:
Doctor, you and I have been pregnant for over ten weeks and have been going for prenatal check-ups on time. Today, I had a screening for Down syndrome, and in the detailed test results, there is one item called OS. What does OSB mean?Doctor's answer:
Down syndrome screening is a prenatal test used to exclude the possibility of Down syndrome in a fetus. It involves extracting blood from the pregnant woman and testing the levels of alpha-fetoprotein and human chorionic gonadotropin in the serum. The test also considers factors such as the pregnant woman's age, weight, estimated due date, and gestational age at the time of blood collection to calculate the risk coefficient for the mother giving birth to a child with Down syndrome. Based on your description, the "OSB" in Down syndrome screening actually refers to "open neural tube defects," meaning that this is the item being specifically screened for.