<prompt> Which of the following is not a component of triple test screening in Down syndrome?EstriolAlpha fetoproteinHcgInhibin alpha  <response>: The triple test is a second trimester screening test used to identify those pregnant women who should be offered a diagnostic test to identify whether their fetus has an aneuploidy down syndrome The triple screen test measures serum level of AFP, Estriol and beta-HCG. High level of hCG and low level of AFP and Estriol are suggestive of positive triple test. Downs Syndrome AFP hCG ESTRIOL Quad test: triple test inhibin alpha. 