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Blood Test Tracker

Alzheimer's Disease Blood Biomarker Panel

Plasma amyloid and phosphorylated tau markers used to assess Alzheimer's pathology in people with symptoms.

4 tests explainedAlso printed as AD-Detect, Amyloid and Tau Blood Test, Alzheimer's Blood Test, PrecivityAD2

The 4 tests in this panel

What each one measures and the range labs usually print for adults. Ranges differ a little between labs, so the range on your own report is the one your result is judged against.

  • p-tau217 (Phosphorylated Tau 217)

    A form of tau protein in blood plasma. Higher levels are linked to amyloid build-up in the brain, and each lab's method has its own cutoffs.

  • Amyloid Beta 42/40 Ratio, Plasma

    The ratio of two amyloid peptides in blood plasma. A lower ratio can be a sign of amyloid build-up in the brain, and each lab method has its own cutoff.

    Adults
    0.095 and above ratio

  • Plasma p-tau217 / Abeta42 Ratio (Lumipulse)

    A calculated ratio of two plasma proteins, p-tau217 divided by amyloid beta 42. A higher ratio makes amyloid build-up in the brain more likely.

  • p-tau181 (Phosphorylated Tau 181)

    A form of tau protein in blood plasma. A result at or below the lab's cutoff makes amyloid changes less likely; a result above it calls for more testing.

Labs can include 5 more tests in this panel that we haven’t written up yet.