Amyloid PET
An amyloid PET scan measures the build-up of amyloid protein in the brain, one of the main signs of Alzheimer's disease. It helps your doctor understand the cause of memory problems.
- Time at the center: About 2 hours
- Scan time: About 30 minutes
- Preparation: Drink water. No fasting.
What is it?
A small amount of a tracer that attaches to amyloid plaques is injected into a vein. After a short wait, a PET/CT scan shows where the plaques are in the brain.
A negative scan makes Alzheimer's unlikely. A positive scan, together with other tests, helps your doctor confirm the diagnosis and discuss treatment options, including newer medicines that target amyloid.
Who is it for?
- Memory loss or confusion without a clear cause
- Suspected Alzheimer's disease
- Evaluation before starting anti-amyloid treatment
- Telling Alzheimer's apart from other types of dementia
Your visit
- Check-inA technologist places a small IV in your arm.
- Tracer injectionYou receive the tracer and wait 40 to 90 minutes while it reaches the brain.
- Your scanYou lie still on a padded table for about 30 minutes.
- Go homeMost people return to normal activities right away. Drink plenty of water.
How to prepare
- Drink plenty of water before your appointment.
- You can eat and take your usual medicines.
- Wear comfortable clothes without metal. Leave jewelry at home.
- A family member or caregiver is welcome to come with you.
We confirm your instructions when we call you.
Common questions
Does an amyloid PET confirm Alzheimer's?
It shows whether amyloid plaques are present. Your doctor combines it with your history and other tests to reach a diagnosis.
Related exams
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