Objective: To determine whether nuchal translucency thickness is influenced by the fetal position at ultrasound examination. Subjects: Transabdominal ultrasound examination for pregnancy dating and measurement of nuchal translucency thickness was performed at 10-14 weeks' gestation in all women attending the antenatal clinic of our hospital. During the examination special attention was paid to a change in fetal position from prone to supine or vice versa. Methods: For each fetus the nuchal translucency measurement was repeated when a positional change from prone to supine or vice versa was recorded. All measurements were recorded on hard copy. An image-scoring method was used and evaluated by three independent reviewers. Results: Eighty-five fetuses were included in this study. The mean nuchal translucency for supine fetuses was 1.91 mm compared with 1.93 mm for prone fetuses. The mean quality-score was 6.54 for supine fetuses and 6.55 for prone fetuses. This difference was not statistically significant. Conclusion: Fetal position has no influence on the measurement of nuchal translucency.
de Graaf, I. M., Müller, M. A., van Zuylen-Vié, A. A., Bleker, O. P., & Bilardo, C. M. (2000). The influence of fetal position on nuchal translucency thickness. Ultrasound in Obstetrics and Gynecology, 15(6), 520-522. https://doi.org/10.1046/j.1469-0705.2000.00136.x