Elevated Immune Cell Ratio Linked to Higher Dementia Risk in Large Study
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A study of nearly 400,000 patients found that a higher neutrophil to lymphocyte ratio (NLR), a common blood test value, is associated with an increased likelihood of developing Alzheimer's disease and other dementias. The association was observed in both the near-term and long-term and appeared stronger for Hispanic patients and women. This research suggests a potential new, easily accessible marker for identifying individuals at elevated risk.
Facts First
- A higher neutrophil to lymphocyte ratio (NLR) is linked to increased dementia risk, according to a study of nearly 400,000 patients.
- The association was stronger for Hispanic patients and women across two large healthcare systems.
- The NLR is calculated from a standard complete blood count, making it a widely available potential risk marker.
- Researchers analyzed patients' earliest NLR measurement taken after age 55 and before any dementia diagnosis.
- The study was supported by multiple National Institutes of Health (NIH) grants and other research foundations.
What Happened
A study published in Alzheimer's & Dementia found that higher NLR levels were associated with an increased likelihood of developing Alzheimer's or dementia. Researchers used each patient's earliest neutrophil to lymphocyte ratio (NLR) measurement taken when they were at least 55 years old and before any diagnosis of Alzheimer's or dementia. They found that higher NLR levels were associated with an increased likelihood of developing these conditions. Researchers defined a 'high' NLR based on the median value of the study participants.
Why this Matters to You
This finding could lead to a simpler way for doctors to assess your long-term brain health during routine check-ups. Since the NLR is derived from a standard complete blood count, a test you may already get, it represents a potentially low-cost and accessible tool. If validated by further research, this marker might help identify individuals who could benefit from earlier monitoring or preventive strategies, though it is not a definitive diagnostic test.
What's Next
The research team, including Dr. Tianshe (Mark) He and Dr. Jaime Ramos-Cejudo, is affiliated with the Vascular and Immune Dysfunction in Aging and Alzheimer's Disease (VIDA) lab. Further studies are likely needed to confirm these findings and understand the biological mechanisms linking immune system balance, measured by the NLR, to dementia risk. This work may inform future clinical trials aimed at prevention or early intervention.