Ten People on Finding Out They Have the Alzheimer’s Gene

In 2017, 23andMe began offering tests for the genetic risk of developing certain health conditions like celiac disease, Parkinson’s, and late-onset Alzheimer’s. The Alzheimer’s test will tell you if you have the gene variant APOE4, which means you have an increased likelihood of developing the disease. One in four people carry a single copy of the gene, but 2 to 3 percent of the population have two copies — one from each parent — and have a much higher probability.