Osbourner, 62, who has battled cancer, said she is terrified of dying due to Alzheimer's like her father, reported Daily Mirror.
"Ozzy and I had these tests done at a university in England, and the results took three months to come back. They test every single cell, chromosome and gene in your body; it's like a DNA test but a million times more sophisticated.
"The results showed I have two of the four genes that give it to you. They're not the two major genes, but they're still there and I have them," she said.
"I was terrified because my dad died from Alzheimer's. It is the most soul-destroying disease. To see someone you love come down with it... It's wicked, it really is.
"There is nothing I can do to prevent it, nothing. People say to take cod liver oil and do puzzles and things, but then I look at people diagnosed with dementia. My father was super active mentally, and take Margaret Thatcher, Ronald Reagan... they were all so active, and that's what really frightens me.