Question: What is the meaning of double marker scanning.
Answer: Hello, I'm happy to help.
Double marker test is screening blood test in pregnancy. ... So after an NT scan, after which you measure the amount of fluid at the back of the neck of the fetus and with the results, this double marker blood test is done and both the combined, and given a combined result as screen positive or negative. It is usually done after 8 weeks of pregnancy up to 14 weeks.