The Quad Screen

The Quadruple (Quad) Screen is a prenatal screening test that evaluates maternal serum levels of Alph Fetoprotein (AFP), Human Chorionic Gonadotropin (hcG) , unconjugated estriol (uE3) and inhibin-A. The only difference between the Quad Screen and the Triple Screen is inhibin A, a protein produced by the placenta, is measured in addition to the AFP, hcG and uE3.

As with the Triple Test, abnormal results are only indicators that there may be something wrong with the fetus. Further diagnostic testing is necessary to definitively tell if there is a true abnormality.