Low maternal alpha-fetoprotein levels in pregnancy are associated with which condition?

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Multiple Choice

Low maternal alpha-fetoprotein levels in pregnancy are associated with which condition?

Explanation:
Low maternal AFP is most linked to Down syndrome. In pregnancies with trisomy 21, the fetus tends to produce less AFP, so the amount crossing into maternal blood is reduced, leading to lower levels on screening. This is why low AFP is used as a marker for chromosomal abnormalities. By contrast, neural tube defects such as anencephaly or spina bifida raise maternal AFP, and twin pregnancies can alter levels in other directions, not typically producing a low AFP pattern.

Low maternal AFP is most linked to Down syndrome. In pregnancies with trisomy 21, the fetus tends to produce less AFP, so the amount crossing into maternal blood is reduced, leading to lower levels on screening. This is why low AFP is used as a marker for chromosomal abnormalities. By contrast, neural tube defects such as anencephaly or spina bifida raise maternal AFP, and twin pregnancies can alter levels in other directions, not typically producing a low AFP pattern.

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