Chromosome 21 aneuploidy:PrThr:Pt:Amnio fld/CVS:Ord:FISH
chromosome 21 aneuploidy:prthr:pt:amnio fld/cvs:ord:fish
Chromosome 21 aneuploidy [Presence] in Amniotic fluid or Chorionic villus sample by FISH
chromosome 21 aneuploidy [presence] in amniotic fluid or chorionic villus sample by fish