Rheumatoid arthritis (RA). Research on the effects of collagen type II in people with RA shows conflicting results. Some research shows that taking collagen type II by mouth for 3 months reduces joint pain, swelling, and time to walk 15 meters in people with RA.
Shares 85. The quad screen test is a maternal blood screening test that looks for four specific substances: AFP, hCG, Estriol, and Inhibin-A. AFP: alpha-fetoprotein is a protein that is produced by the fetus. hCG: human chorionic gonadotropin is a hormone produced within the placenta.
Definition. The quad screen â also known as the quadruple marker test or simply the quad test â is a prenatal test that measures levels of four substances in a pregnant woman's blood: 1  Alpha-fetoprotein (AFP), a protein made by the developing baby. 2  Human chorionic gonadotropin (HCG), a hormone made by the placenta.