Chromosome 18 Aneuploidy in Amniotic Fluid or Chorionic Villus Sample by FISH Nominal

**Semantic type:** Laboratory Procedure

**Definition:** A nominal fluorescent in situ hybridization-based procedure that detects chromosome 18 aneuploidy in an amniotic fluid or chorionic villus specimen.

**Synonyms:** - Chromosome 18 aneuploidy in Amniotic fluid or Chorionic villus sample by FISH Nominal