ADNI’s goals include testing new ways to identify changes to a person’s brain health. Some of these tests may allow us to see changes before a person experiences any symptoms. The second phase of the study, the ADNI Blood Biomarker study, will ask some participants to give a blood sample. The blood sample will be analyzed using new scientific tests that may show if a person is at higher risk for Alzheimer’s. These new tests could be an important step to find new and improved ways to diagnose and treat Alzheimer’s.