Abstract
The measurement of the fetal nuchal translucency thick-ness (NT) combined with maternal age and maternalblood biochemical markers [free beta human chorionicgonadotrophin (free βhCG) and pregnancy-associatedplasma protein A (PAPP-A)] is widely accepted and nowthe most commonly used method for screening Downsyndrome (DS) in the first trimester. Most often, mater-nal blood is taken during the NT visit, and it usuallyrequires a week or two to measure biochemistry andproduce a final report. A one-stop clinic assessment ofrisk model has been proposed, but most clinics do nothave sufficient clinical volume to afford it financially(Spencer
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