I do not know, if the DNA test for Huntington's is available everywhere.
However I do know that Asger Sorensen in Denmark is a leading researer in this
field. Try to contact him, if the test is not offered in your area:
Asger Sorensen
Arvebiologisk Institut
Panum Instituttet
Blegdamsvej 3
2200 Kobenhavn N
DENMARK