During which weeks is nuchal translucency screening typically performed?

Nuchal translucency screening is typically performed between 10 and 13 weeks of gestation. This is a non-invasive ultrasound test that measures the thickness of the nuchal fold, which is the fluid collection at the back of the fetal neck. Increased thickness can be associated with chromosomal abnormalities, such as Down syndrome (trisomy 21) and other congenital anomalies.

The timing of the procedure is critical because it helps ensure the best chance of detecting potential abnormalities early in pregnancy when other diagnostic options may not yet be available. Early screening allows for timely decision-making regarding further testing or intervention if necessary, making this period optimal for nuchal translucency measurement.

Screening performed outside the 10-13 week window is not standard practice, as the accuracy of the test may be diminished and the specific markers for conditions being assessed have different gestational timing for optimal assessment.