A Simple Blood Draw Can Now Help Spot Alzheimer's. Here's Who Should Ask
Four FDA-cleared blood tests can now help doctors spot Alzheimer's changes without a PET scan. What they show, who they're for, and the coverage catch.
For decades, confirming the brain changes behind Alzheimer's meant an expensive PET scan or a spinal tap. In 2026, that changed fast. There are now four FDA-authorized blood tests that help doctors check for the amyloid plaques linked to the disease, and one of them is built for your family doctor's office.
What changed
The first test, Lumipulse, was cleared in May 2025. This year Roche's Elecsys pTau217 became the first single-marker blood test cleared to help rule Alzheimer's pathology in or out for adults 55 and older with memory or thinking complaints, using the same cutoffs in primary and specialty care. In a study of more than 2,100 adults, its results matched PET scans in about 88% of people with cognitive impairment. A second test, PrecivityAD2, is cleared for symptomatic patients as young as their 40s.
Who it's for, and who it isn't
These tests are for people who already have symptoms: repeating questions, getting lost on familiar drives, a spouse noticing changes. They are not a screening test for healthy people curious about their future. A result is one piece of the puzzle, read alongside a memory evaluation.
Why earlier answers matter
- Treatment windows. Newer drugs like lecanemab and donanemab work best in early stages.
- Peace of mind. A negative result can steer doctors toward fixable causes like sleep apnea, thyroid problems, B12 deficiency or medication side effects.
- Planning. Families get time for legal, financial and driving decisions while everyone can take part.
- Lifestyle still counts. The 2025 U.S. POINTER trial found structured exercise, diet, brain training and heart-health habits helped protect thinking skills.
The coverage catch
As of late August 2026, Medicare had no national coverage policy for these tests; regional contractors decide case by case. Ask your doctor's office about cost before the draw.
What to say at your next visit
"I've noticed some changes in my memory. Would a cognitive evaluation and an Alzheimer's blood test make sense for me, and what would it cost?" That one sentence opens the door.
This article is for general information, not medical advice.
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