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Blood Test for Alzheimer’s Now on the Market


The -C₂N Diagnostics firm is marking the two-year anniversary of being the first to ffer its widely accessible blood test for Alzheimer’s. Learn more.

C₂N Diagnostics, which brings Clarity Through Innovation™ with laboratory services and products to the brain health field, has marked an important milestone: The two-year anniversary of it being the first to offer a widely accessible blood test to aid clinicians in Alzheimer’s diagnosis.

The company launched the PrecivityAD blood test during the height of the COVID pandemic in October 2020.

During the past 24 months, independent research journals have published numerous validation studies on the test.

Validation of the blood test

Molecular Neurodegeneration was the first to publish a research paper that stated the PrecivityAD blood test “can accurately identify brain amyloid status based on a single blood sample.”

This was followed by Clinica Chimica Acta publishing analytical validation results and JAMA Network Open publishing results of two independent studies that demonstrated the high diagnostic performance of the PrecivityAD test.

Additional research findings

Additional independent research was published in Journal of the American Medical Association Neurology with findings from BioFINDER’s large comparison of blood plasma amyloid-beta assays.

One of the assays included in the study was the liquid chromatography-mass spectrometry (LC-MS/MS) assay that Dr. Randall Bateman (a co-founder of C2N) and his laboratory developed at Washington University that underpins the PrecivityAD blood test. The international research group found it was superior to the other amyloid beta tests studied for identifying amyloid pathology in the brain.

More recently, another important independent research study published in Brain, which included coauthors Drs. Nicolas R Barthélemy, Yingxin He, and Randall Bateman from Washington University, found their p[hospho]-tau217 ratio LC-MS/MS blood test was superior to nine other tau blood tests, including various p-tau181, p-tau217, and p-tau231 immunoassays for both identifying abnormal brain amyloid status and also for predicting future progression to Alzheimer’s dementia.

This p-tau217 test, which has been successfully transferred over to C2N for industrial scale-up, automation, and standardization is making commercial development progress in various intended use applications.

Test being used for early detection

These independent studies occurred as the landmark AHEAD study announced it is using C2N’s blood-based biomarkers to screen for the presence of amyloid plaques in the brain, a hallmark sign of Alzheimer’s disease.

This is part of a clinical trial occurring at 75 research centers aimed at preventing memory loss using lecanemab, an anti-amyloid antibody therapy developed by Eisai Co. Ltd, and Biogen Inc., that recently demonstrated in a large clinical study (Clarity AD) delays in cognition decline among individuals with early Alzheimer’s disease.

The PrecivityAD test continued to reach more people when the Davos Alzheimer’s Collaborative launched its international flagship program to improve early disease detection. This initiative is using the test as a critical diagnostic aid for proper Alzheimer’s diagnosis at seven health care systems and six countries around the world.

Back at C2N’s St. Louis headquarters, the Accreditation Committee of the College of American Pathologists (CAP) awarded accreditation to the company’s lab based on an on-site inspection that yielded zero inspection deficiencies. It also achieved ISO 13485:2016 certification for its quality management system, and the PrecivityAD test earned the CE Mark from the European Union.

Impressive results lead to growth

C2N’s success has furthered strengthened its belief in its mission to become a world leader in providing best-in-class diagnostic products and services for the benefit of patients.

Toward that goal, it recently introduced the p-tau multi-analyte assay for Research Use Only. Shown at this year’s Alzheimer’s Association International Conference, combining C2N’s plasma Aβ42/40 ratio assay with p-tau217 ratio assay yields a blood test with comparable accuracy as the current gold standards for Alzheimer’s brain pathology detection (amyloid PET imaging or cerebrospinal fluid tests), albeit at a lower cost, with less invasive sampling needs, and much lower complexity.

This promising technology progress is stimulating many creative partnerships for the company, including with leading companies like Eisai in the U.S., Healius in Australia, and Grupo Fleury in Brazil.

Patients grateful for answers

These accomplishments have real world consequences for patients and families, some of whom have shared their stories with the public. spoke with a senior who shared that he knew his memory was slipping and sought answers to the cause. His PrecivityAD test result helped his doctor officially diagnose him with Alzheimer’s, which now allows him to assess potential care options.

AARP The Magazine reported on Shelby Hileman, who also received an Alzheimer’s diagnosis after her doctor reviewed her PrecivityAD blood test result. Now, Hileman is eligible to explore participating in clinical trials for dementia drugs.

In a TV story, a wife shared why her husband decided to take the PrecivityAD blood test after his doctor recommended it. He’s dealing with memory loss and other cognitive issues; they feared he had Alzheimer’s disease.

A screening tool

Dr. Joel Braunstein, C2N’s CEO, says, “We’re honored to provide breakthrough diagnostic tools to the brain health sector. A clinical need exists, and few ambitions are as fulfilling to our talented team to know that they are making a difference in patients’ lives.

“We have heard from many healthcare providers, patients and families that our blood biomarkers have given them the answers they need to understand difficult situations. Our work is only beginning; however, the advancements we’ve brought to market in a short period of time provides us momentum for success and expansion in the future.”

Dr. Howard Fillit is Co-Founder and Chief Science Officer of the Alzheimer’s Drug Discovery Foundation (ADDF), which provided funding to support the development of the PrecivityAD test as part of its biomarker research initiatives. He says, “Our congratulations to the entire C2N team on this two-year achievement.

“The PrecivityAD blood test has succeeded in putting the early and specific diagnosis of Alzheimer’s disease into the mainstream of physician practice. It has also demonstrated its important role in clinical trials by making screening enrollment and the monitoring of drug effects less expensive and more efficient.”

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B. Berger

B. Berger

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