performed during pregnancy to determine if a fetus is affected with a particular
disorder. Chorionic villus sampling (CVS), amniocentesis, periumbilical blood
sampling (PUBS), ultrasound, and fetoscopy are examples of procedures used
either to obtain a sample for testing or to evaluate fetal anatomy.
Definition from: GeneReviews
from the University of Washington and the National Center for Biotechnology Information
Related discussion in the Handbook
See also Understanding Medical Terminology.