If the prenatal test is negative, is it possible anyway that the parent is a gene carrier?

Good morning,
I’ll try to explain myself in the best possible way: my partner's grandfather and mother are affected by Huntington's chorea, but my partner did not want to undergo the test (choice that I respect); now I am pregnant and we managed to do the test on the fetus that was negative to the disease...
My question is: is there any chance that also my partner has not inherited the disease? Or does a one in two possibilities always apply?


Good morning and thanks for writing to us. Even if the fetus is negative, there is still the possibility (one in two possibilities) that your husband could have inherited the mutation, even if he then did not pass it on to the fetus. In our opinion, however, it is serious that it has not been explained to you in detail before.