Alzheimer's disease (AD) is the most common cause of dementia, but cognitive decline also occurs in other neurological conditions, such as Parkinson's disease, Lewy body dementia, vascular dementia, and frontotemporal dementia.

Elecsys Phospho-Tau (181P) Plasma (Roche), a blood-based diagnostic test, has been cleared by the FDA to aid in the initial assessment of amyloid plaque pathology associated with Alzheimer's disease (AD) in patients ≥55 years old with signs of cognitive decline. It is the second blood test for AD biomarkers to be cleared by the FDA; the Lumipulse G pTau217/β-Amyloid 1-42 Plasma Ratio test was cleared in 2025 (see Table 1).

The FDA has cleared the Lumipulse G pTau217/β-Amyloid 1-42 Plasma Ratio (Fujirebio), a bloodbased diagnostic test, for early detection of amyloid plaque pathology associated with Alzheimer's disease (AD) in adults ≥50 years old who are showing signs and symptoms of the disease. The new assay is the first blood test for amyloid biomarkers to become commercially available in the US. The Lumipulse G β-Amyloid Ratio (1-42/1-40), which measures amyloid biomarkers in cerebrospinal fluid (CSF), was cleared by the FDA in 2022.