Concerning alpha-fetoprotein (AFP),which one of the following statements is correct?

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Maternal serum AFP levels are measured as a part of prenatal screening for neural tube defects and Down syndrome. The best time to measure it is at 16 weeks of gestation, when it reaches its peak (around 3.5 µg/dL) and then declines. A decrease in AFP may indicate the possibility of Down syndrome, while an increase may indicate neural tube defects. AFP levels rapidly increase up until 11 weeks, after which it gradually declines until it stabilizes at a lower level.

Concerning Alpha-Fetoprotein (AFP),which One of the Following Statements Is Correct