Patient's question:
What is the meaning of the Down syndrome risk value OSB1;236/?Doctor's answer:
Down syndrome, also known as trisomy 21, refers to a condition where the patient has an extra chromosome in the 21st pair compared to the normal number.Down syndrome screening is performed by measuring the levels of AFP and HCG in the pregnant woman's serum, combined with the woman's age, weight, and gestational age to estimate the risk value. The critical value is 1/275. A value greater than this indicates high risk, while a value lower than this indicates low risk. The probability of Down syndrome (DS) in the general population is 1/750.
The purpose of detailed Down syndrome screening is to determine the risk level of the fetus developing Down syndrome by testing the pregnant woman's blood. If the detailed Down syndrome screening results show a high risk of the fetus developing Down syndrome, further diagnostic tests such as amniocentesis or chorionic villus sampling should be performed.