Just to stir somewhat – if a test was done in vitro (as most genetic tests on embryos are – there is a whole branch of genetic testing known as pre-implantation genetic diagnosis) then you would know the results of the test prior to the embryo being placed into the mother, therefore the issue of a termination is irrelevant. Really it’s whether or not you’d want to know. Added to the fact that type 1 diabetes is a combination of genetics, causing a predisposition to the condition, and external factors causing it, there would be no way to tell from a genetic test. (I know the question was hypothetical, but I study this stuff so I had to point it out!)