Which test is used to detect Down syndrome by collecting blood from the umbilical cord after the 18^th week of pregnancy?

Name: Which test is used to detect Down syndrome by collecting blood from the umbilical cord after the 18 th week of pregnancy?
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Fetal blood sampling (FBS), also known as cordocentesis, involves collecting blood from the umbilical cord to test for various conditions, including chromosomal abnormalities like Down syndrome, after the 18th week of pregnancy.

Which Test Is Used to Detect Down Syndrome by Collecting