These tests DO NOT diagnose a problem; they only signal that further testing should be done.
Results are usually returned between one and two weeks.
MSAFP may be performed between the 14th and 22nd weeks of pregnancy, however it seems to be most accurate during the 16th to 18th week.
However, the quad screen looks for not only the three specific substances evaluated in those tests (AFP, h CG, and Estriol) but also a fourth substance known as Inhibin-A.
The screen is essentially the same as the screening tests that look for only three substances, except the likelihood of identifying pregnancies at risk for Down Syndrome is higher through the evaluation of Inhibin-A levels. It is very important to remember what a screening test is before getting one performed.