ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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In obstetric ultrasound, what does the term "nuchal translucency" refer to?

  1. The heartbeat of the fetus

  2. The size of the fetus

  3. The fluid-filled space at the back of the fetus's neck

  4. The position of the fetus in the womb

The correct answer is: The fluid-filled space at the back of the fetus's neck

Nuchal translucency refers specifically to the fluid-filled space located at the back of a fetus's neck. This measurement is performed during the first trimester, typically between 11 to 14 weeks of gestation, and is an important aspect of prenatal screening. A thicker nuchal translucency measurement can be associated with an increased risk of chromosomal abnormalities, such as Down syndrome, as well as congenital heart defects and other issues. This measurement is captured via ultrasound and is used in conjunction with other tests to evaluate the likelihood of potential problems with the pregnancy. It is not related to the heartbeat of the fetus, the overall size of the fetus, or the fetal position in the womb, making it a distinct and specific term in obstetric ultrasound.

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