<prompt> In Downs syndrome, the 2nd trimester quadruple test done at 14-20 weeks measure levels of all of the following, EXCEPT:Alpha fetoproteinHCGInhibin AProgesterone  <response>: The triple test 14 -20 weeks measures the following three levels in the maternal serum: Alpha-fetoprotein AFP Human chorionic gonadotropin hCG Unconjugated estriol UE3 Quadruple test done 14-20 weeks measures levels of: Alpha-fetoprotein AFP Human chorionic gonadotropin hCG Unconjugated estriol UE3 Inhibin A 