Question

Nuchal translucency on USG can be detected at how many weeks of gestation?

• A. 11-13 weeks
• B. 18-20 weeks
• C. 8-10 weeks
• D. 20-22 weeks

Hint:

NT is a first-trimester screen, measured at about 11 to 13 weeks 6 days.

Answer 1

The Correct Option is A

Step 1: Nuchal translucency screening looks at the thin sonolucent collection behind the fetal neck, an early marker for chromosomal abnormalities such as Down syndrome.
Step 2: For a valid measurement the crown-rump length must fall in the correct range, which corresponds to roughly 11 weeks 3 days through 13 weeks 6 days of gestation. This makes the late first trimester the standard window.
Step 3: Earlier than this the structure is too small to measure dependably, and after the first trimester the translucency disappears, so later windows are inappropriate. Therefore NT is detected at 11-13 weeks.
\[\boxed{\text{11-13 weeks}}\]