While there’s no one identifiable cause of Alzheimer’s, genetics may play a key role. One gene in particular is of interest to researchers. Apolipoprotein E (APOE) is a gene that’s been linked to the onset of Alzheimer’s symptoms in older adults.
Blood tests can determine if you have this gene, which increases your risk of developing Alzheimer’s. Keep in mind that even if someone has this gene, they may not get Alzheimer’s.
The opposite is also true: Someone may still get Alzheimer’s even if they don’t have the gene. There’s no way to tell for sure whether someone will develop Alzheimer’s.
Other genes could also increase risk of Alzheimer’s and early onset Alzheimer’s. Learn more about the link between genes and Alzheimer’s disease.