The Ever Evolving 11-14 Week Scan

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Cathy Ridsdale


Advancements in ultrasound equipment have led to improved resolution of smaller structures. In turn, this has allowed for the evolution of the 11–14-week scan. At its inception, the first-trimester scan was used primarily to indicate the risk for aneuploidy in a fetus. However, as time passed, the ability to detect structural abnormalities complemented the risk for chromosomal abnormalities. This literature review will discuss the evolution of the 11–14-week scan up to current-day recommendations for population screening.

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