Should I get genetic testing for dementia?

For most people, no. Routine genetic testing, such as the APOE gene, cannot tell you whether or when you will get dementia, so it rarely changes anything. Testing mainly makes sense when there is a strong family history of early-onset dementia, and it is best done with genetic counseling.

It is natural to want certainty, but for most people genetic testing does not provide it, and can cause worry without changing what you would actually do.

Two very different kinds of test

Risk-gene testing (for example APOE). This looks at genes that raise or lower the odds, not ones that decide the outcome. A "high-risk" result does not mean you will get dementia, and a "low-risk" result does not mean you are safe. Because it cannot predict whether or when dementia will happen, most experts, including the Alzheimer's Association, do not recommend it for routine use.

Deterministic-gene testing. For the rare families with an inherited, early-onset form, a test can show whether someone carries the specific mutation that causes it. This is meaningful information, but it is emotionally heavy and best approached carefully.

When testing may make sense

Testing is most useful when there is a strong family history of dementia striking early (before 65) across several relatives. In that situation, talk to your doctor about a referral for genetic counseling, where a specialist helps you weigh what a result would mean for you and your family before you decide whether to test.

For everyone else

If your main question is "how do I lower my risk?", a genetic test will not help you, but your daily habits might. Protecting your heart health, staying active, not smoking, and staying socially and mentally engaged are within your control and are linked to lower risk, whatever your genes.

This is general information, not medical advice. Every situation is different, so talk to a doctor about yours.