this, so an answer one day is not necessarily valid for the next day. (The Our HD Space team) My sister is gene positive with a repeat count of 39. I understand this as being a low number. If i test positive as well will my number be similar or are they totally unrelated? Asked By Ross, 38 The answer to this question depends, to some degree,  on who was the gene positive parent. That is, the answer will be a little complicated. If Ross inherits the gene (a 50% or 1 in 2 chance) then most likely he will have the same or very similar repeat count as his sister. However, if inheritance is from the father, there  is a small chance the repeat number will increase whereas this is less likely if inheritance is from the mother. It is also important to remember that if the repeat number is less than 40 then the average age of onset of symptoms  will be greater than if the repeat count was 40 or more. There will also be a less than 100% chance of developing symptoms of HD -Dr Andrew i want to help with trying to find a cure for hd. altho my grades are not great and im not shure i will be able to get a doctor dagree. can i still help Asked by Kyle aged 15 There is heaps you can do to try to find a cure Kyle! Doctors and Scientists need money to pay