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Nuchal fold thickness at 14-16 weeks' gestation as measured by transvaginal sonography
Objective:
To establish normal values of fetal nuchal fold thick-ness at 14-16 weeks of gestation by transvaginal sonography.
Methods:
Transvaginal sonography was used to measure nuchal fold thickness in 182 normal pregnancies at 14-16 weeks of gestation. Nuchal fold thickness was measured as the distance from the outer skull bone to the outer skin surface in the transverse axial image in the suboccipital-bregmatic plane of the head.
Results:
There was no significant association between nuchal fold thickness and gestational age (r = 0.084; P = 0.258). The mean (standard deviation) was 2.2 (0.5) mm and the 95th centile was 3.0 mm.
Conclusions:
The 95th centile of nuchal fold thickness measured by transvaginal sonography at 14-16 weeks is 3.0 mm.