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This isn't a predictive test that someone could take in early life.

It's used to refine clinical diagnosis after patients present with cognitive severe decline.

By the time someone gets this test, they have severe problems. The purpose of this test is to assist with the right diagnosis.

As per the article, the test is used in conjunction with clinical diagnosis, not instead of.

https://doi.org/10.1038/s41591-025-03622-w this is the paper they're basing the research on. So in primary care, the accuracy rates are in the 80s. So that's something like a 17% false positive rate. That's still like 5 to 1 odds of getting a correct result though. It's much better than nothing.