Other geneticists argue that PGTP doesn't have adequate predictive power to significantly reduce disease risk for many conditions. Proving that these tests' work as intended will be a long and extremely difficult task, says Hershey. For most people who don't have a genetic predisposition to type 1 diabetes, the chances that their child will develop the condition are exceedingly rare.
Companies are offering genetic tests of embryos generated by in vitro fertilization that they say allow prospective parents to choose those with the lowest risk for diseases such as diabetes or certain cancers. However, some researchers are concerned about the accuracy and ethics of these tests.
This is an audio version of our Feature: The controversial embryo tests that promise a better baby
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