Alzheimer's blood markers (p-tau217)
FoundationalDiscussed but contested· as needed
What it measures
Blood proteins (such as p-tau217) studied in relation to the brain changes seen in Alzheimer's disease.
Why it's discussed for longevity
A fast-moving area; a first blood test was recently cleared for use.
Discussed but contested
The cleared test is an aid for people who already have memory symptoms and are being evaluated by a specialist, not a screen for people without symptoms.