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FAQMemory & Cognitive ChangesNoticing Changes

How is dementia diagnosed?

Quick answer · Updated November 2026

There is no single test for dementia. A doctor looks at medical history, does a physical exam and memory tests, and may order lab work or brain scans. Input from family also helps.

Part of the visit is ruling out other problems that look like dementia. Depression, sleep apnea and delirium can cause similar symptoms, and many of these can be treated.

Before the visit, write down what you have noticed and when it began. Note falls, mood shifts, missed bills or trouble with daily tasks. Bring a list of all medicines. The doctor may ask a family member to describe changes, so plan to go along if your parent agrees.

The doctor may also suggest a specialist for more detailed memory tests. Our guide to the stages of dementia explains what may come next.

Sources

  1. alz.org

This answer is general information, not medical, legal or financial advice. Rules can vary by state.

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