A hormone that is produced by the fetus and passed into bloodstream of the mother. During a quad screen test, offered during the second trimester, healthcare providers are able to measure the levels of this hormone. Heightened levels may indicate an increased risk for Down syndrome in the developing baby.
Found on http://www.pregnology.com/AZ/I/3
Found on http://www.whattoexpect.com/pregnancy/glossary/i.aspx
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