First Trimester Down Syndrome Screen: At a Glance

First Trimester
Down Syndrome Screen

Formal name: First Trimester Screen – Pregnancy-associated plasma protein-A (PAPP-A), human chorionic gonadotropin (hCG), as either free beta subunit or total hCG, and a nuchal translucency ultrasound
Related tests: Triple/Quad Screen, total hCG

email this page

print this article

	At A Glance
	Why get tested? To assess the risk of carrying a fetus with chromosomal abnormalities, such as Down syndrome and trisomy 18 When to get tested? Usually between 10 weeks, 4 days and 13 weeks, 6 days of pregnancy Sample required? A blood sample drawn from a vein in the arm and a special ultrasound Note: You may be instructed to have a full bladder when having the nuchal translucency ultrasound performed. Next >>

This article was last reviewed on July 5, 2007.

In the News • Understanding Your Tests • Inside the Lab
About the Site • Site Map • Send Us Your Comments • Home

We comply with the HONcode standard for trustworthy health
information:
verify here.