<prompt> A 24-year-old patient presents to OPD at 18 weeks of pregnancy with a previous history of a child with Down syndrome. The most appropriate isTriple testChorionic villous biopsyAmniocentesisCordocentesis  <response>: Tripple test gives risk ratio and for fuher confirmation amniocenteses has to be done Tripple test MSAFP, hCG, UE3 it is performed at 15-18 weeks while amniocenteses in performed at 16 weeks of pregnancy 