Although it accounts for 1 percent of all Alzheimer’s cases, Autosomal Dominant Alzheimer’s Disease (ADAD) runs strongly in families and tends to show up earlier in life. In some cases, people have developed symptoms as early as their 30’s. Luckily, genetic testing and other methods can be used to diagnose Autosomal Dominant Alzheimer’s Disease (ADAD). So, if your family has a history of early onset Alzheimer’s, getting tested to assess your risk and your other family members’ risk can be helpful in identifying whether or not you’re at risk for developing early onset Alzheimer’s.