You can still have cancer if a PET scan is negative. That’s because some types of tumors are harder for PET scans to detect.

PET scans can light up tumors in the body and help doctors determine if they are cancerous or benign (noncancerous). The results of a PET scan help guide medical decisions.

A heart PET scan is an imaging tool, offering information on blood flow and heart health. Learn more about how this scan helps with diagnosing heart conditions.

PET scans require dietary preparation, sometimes up to 24 hours before your test, so it's important that you know what foods to eat before a PET scan.

According to the Alzheimer’s Association, the out-of-pocket cost for an amyloid PET scan averages $3,000 or more. Medicare and private insurance do not typically cover the cost of amyloid PET scans.