First trimester fetal nuchal translucency: problems with screening the general population. 2.

Objective: To investigate first trimester nuchal translucency > or = 3 mm as a screening test for aneuploidy in the normal pregnant population.

Design: A pilot observational study.

Setting: University College Hospital, London.

First trimester fetal nuchal translucency: problems with screening the general population. 1.

Objective: To evaluate the feasibility of measuring first trimester nuchal translucency in an unselected population, to assess the relationship with gestation and maternal age and to measure reproducibility.

Design: A prospective observational study.

Setting: University College Hospital, London.