Unless, of course, the patient has the same feelings that you believe happened in this case, which is that they really didn't want the child in the first place. Doc certainly wouldn't be much at risk if he's given someone justification for ridding themselves of an unwanted child, would he?
In this country, nobody needs “justification” if they want to have an abortion. If you’re pregnant and don’t want to carry to term, you go have an abortion. If a woman is flaky enough to wait for some half-baked undefinitive “justification” like a doctor saying her fetus “might” have Downs, before proceeding with an abortion she wanted anyway, she’s also flaky enough to change her mind after the fact. Especially when she realizes she’s already rid of the baby she didn’t want anyway, and now has guaranteed route to collecting a few million dollars by suing the doctor. And you can be sure that ob/gyns and their malpractice insurers know this.