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Did you do The Down screening? What is the difference between early Tang and Middle Tang?

"Down screening", referred to as Tang screening, is one of the must-do items for obstetric examinations to assess the risk of the fetus suffering from Down syndrome.

Tang sieve is divided into early pregnancy Tang sieve and second trimester Tang sieve, what is the difference between early Tang and middle Tang? Must I do both or can I choose one or the other?

Did you do The Down screening? What is the difference between early Tang and Middle Tang?
Did you do The Down screening? What is the difference between early Tang and Middle Tang?
Did you do The Down screening? What is the difference between early Tang and Middle Tang?
Did you do The Down screening? What is the difference between early Tang and Middle Tang?

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