CCC 2274 Since it must be treated from conception as a person, the embryo must be defended in its integrity, cared for, and healed, as far as possible, like any other human being.
Prenatal diagnosis is morally licit, “if it respects the life and integrity of the embryo and the human fetus and is directed toward its safe guarding or healing as an individual. .. It is gravely opposed to the moral law when this is done with the thought of possibly inducing an abortion, depending upon the results: a diagnosis must not be the equivalent of a death sentence.”1
1 CDF, Donum vitae I, 2.