Screening in the First Trimester. Screening for Down Syndrome.

down syndrome screening ultrasound

Screening in the first trimester, screening for Down Syndrome, combined screening test or early biochemical screening are all synonyms but it is best to talk about screening in the first trimester. Now I’m going to explain why. We need to understand what this screening is and what its objectives are.

Combined screening test is performed to detect trisomy 21 (Down Syndrome), trisomy 13 (Patau Syndrome), and trisomy 18 (Edwards Syndrome).