Is a person afflicted with HD; that was not hereditary, more or less prone to symptoms? The CAG measurement for us was less than or equal to 26 and the second set was greater than or equal to 43 repeats. I am confused, studies indicate 26 or less you most likely do not have the mutant 4th chromosome gene and if your number is higher than 40 you most likely do. How can I have such conflicting measurements?