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What gestational age is most commonly associated with routine congenital abnormality screening?

  1. 10-12 weeks

  2. 14-16 weeks

  3. 18-20 weeks

  4. 22-24 weeks

The correct answer is: 14-16 weeks

The gestational age most commonly associated with routine congenital abnormality screening is 14-16 weeks. During this time frame, various screening tests can be performed to assess the risk of chromosomal abnormalities, such as Down syndrome and other trisomies. This period is significant because it aligns with the timing of the first trimester screening and the initial blood tests, which can include maternal serum markers. Additionally, this time frame allows for comprehensive ultrasound assessments that can reveal structural abnormalities in the developing fetus. Identifying potential issues during this stage is crucial, as it gives expectant parents options and the ability to make informed decisions regarding further testing and prenatal care. In contrast, earlier gestational ages, like 10-12 weeks, are primarily focused on confirming pregnancy viability and early genetic screening, but are not as comprehensive for congenital abnormalities. Gestational ages beyond 16 weeks, while still relevant for screening, typically involve follow-ups, additional detailed ultrasounds, or the anatomy scan that occurs around 18-20 weeks, which is more diagnostic in nature rather than routine screening.