Common white blood cell marker identifies Alzheimer’s risk years before cognitive decline begins

High neutrophil levels in common blood work may flag Alzheimer’s risk years early, according to new research from NYU Langone Health.

By: AXL Media

Published: Apr 23, 2026, 8:07 AM EDT

Source: Information for this report was sourced from ScienceDaily

The Diagnostic Potential of Immune Response Markers

A breakthrough investigation involving two major healthcare systems has identified a routine blood measurement that could serve as an early warning system for Alzheimer’s disease. Scientists focused on neutrophils, the primary first-responders of the immune system, and their balance against other white blood cells, known as the neutrophil to lymphocyte ratio or NLR. According to Tianshe He, a data scientist at NYU Grossman School of Medicine, this study is the first large-scale evidence that neutrophil metrics are tied to future dementia risk in humans. The findings suggest that clinicians could use existing laboratory data to flag vulnerable individuals long before the first signs of memory loss or cognitive impairment appear.

Data Mining the Path to Cognitive Health

To validate the predictive power of this blood marker, researchers analyzed the records of approximately 285,000 patients from NYU Langone hospitals and 85,000 individuals from the Veteran's Health Administration. The team specifically isolated the earliest qualifying blood tests taken after patients reached age 55, ensuring that the readings preceded any formal dementia diagnosis. By tracking these patients over time, the researchers observed a consistent pattern where those with high NLR levels were significantly more likely to develop neurodegenerative conditions. The study highlights that this elevated immune activity is not just a symptom of late-stage disease but a precursor that manifests years in advance.

Demographic Vulnerabilities and Statistical Trends

The analysis uncovered specific populations that may be more sensitive to these inflammatory signals. While the link between elevated immune cells and dementia remained constant across the entire study group, the association was notably stronger among Hispanic patients and women. According to the research, it remains unclear whether these disparities are the result of genetic predispositions or external social factors, such as varying levels of access to healthcare. Regardless of the underlying cause, the data suggests that monitoring immune markers could be particularly vital for these high-risk subgroups to ensure they receive timely interventions.