Can huntington disease be detected before the child is born?

With PGD: I suspect that if a pregnancy is conceived by ivf, preimplantation genetic diagnosis could be used to detect which embryos carry the genetic factors to cause huntington's disease, allowing one to only implant embryos that lack that factor. At this point, it cannot be detected in a natural pregnancy, though technology for noninvasive detection of various disorders is under development.

Yes in Mom and child: A gene test can be done on any individual. If the mother carries the gene, she will eventually become symptomatic with huntington disease. Any child of hers will have a 50% chance of inheriting the gene and the disease. Prenatal testing of the child in utero can be performed. Any sort of prenatal testing should involve a genetic counselor consultation, as there are many issues to consider.