An Amyvid scan that shows a similar amount of plaque as scans from people with AD is called a positive scan. People with other conditions that cause thinking or memory problems as well as older people with normal thinking or memory can also have that amount of plaque in their brain. Doctors use Amyvid in combination with other tests. A positive Amyvid scan does not mean you definitely have AD or another thinking or memory disorder. Amyvid should not be used to predict dementia or other brain conditions. It also should not be used to track whether a treatment is working.