Prenatal testing is used to detect birth defects, chromosome abnormalities, genetic diseases, or other conditions or diseases in a fetus or embryo. It can also be used to determine the sex of the fetus before birth. Such screening is useful to (1) enable timely medical or surgical treatment of a condition before or after birth, (2) give the parents the chance to abort a fetus with the diagnosed condition, and (3) give the parents the chance to psychologically, socially, financially, and medically prepare for a baby with a health problem or disability, or for the likelihood of a stillbirth.