pregnant-300x200Expectant parents have gotten an ugly exposure to a rapacious aspect of modern medicine: Over testing, over diagnosis, and over treatment, specifically with a new, fast-growing high-tech twist.

The grownups — whether over-reaching to safeguard the unborn or in a simply silly way to determine the gender of their hoped-for bundle of joy — are ordering unnecessary, expensive, and too often alarming prenatal genetic blood tests. These rapid exams purport to tell whether a fetus may have the rarest of congenital diseases, the New York Times reported in some admirable digging, triggered by a stack of patients’ surprise medical bills.

Reporters Sarah Kliff and Aatish Bhatia found a big problem with the high-tech prenatal screens: The tests too often are dead flat wrong.