Topic: Health

Researchers found that a simple blood test can reveal people at risk of developing Alzheimer's disease and related dementias years before symptoms appear. The test measures the balance between neutrophils and other immune cells in the bloodstream.

Neutrophils are a type of white blood cell that helps fight infections and inflammation. When the immune system is activated, their numbers can rise quickly, changing the balance with other immune cells. Doctors can measure this balance using a standard lab value called the neutrophil to lymphocyte ratio (NLR). A new study from NYU Langone Health suggests that this simple measurement may do more than reflect current illness. It could also help identify people at higher risk of developing Alzheimer's disease and related dementias, even before any symptoms appear.

The study examined NLR data from nearly 400,000 patients across two large healthcare systems. The researchers found that higher NLR levels were consistently associated with an increased likelihood of developing Alzheimer's or other forms of dementia. This relationship held true for both near-term and long-term risk.

The analysis also revealed differences among subgroups. Hispanic patients showed a stronger association between elevated NLR and dementia risk, though it remains unclear whether this reflects genetic influences or social factors such as differences in access to care. Women in both healthcare systems also had a higher risk linked to elevated NLR.

Why It Matters

This study is important because it could help identify individuals who may benefit from closer monitoring, additional testing, or early interventions before cognitive symptoms emerge. This could lead to better treatment and management of Alzheimer's disease.

Key Facts

• The study examined NLR data from nearly 400,000 patients across two large healthcare systems.
• Higher NLR levels were consistently associated with an increased likelihood of developing Alzheimer's or other forms of dementia.
• Hispanic patients showed a stronger association between elevated NLR and dementia risk.
• Women in both healthcare systems also had a higher risk linked to elevated NLR.

Key Terms

Neutrophil-to-lymphocyte ratio (NLR)

A simple measurement that shows the balance between neutrophils and other immune cells in the bloodstream

Implications

This study is important because it could help identify individuals who may benefit from closer monitoring, additional testing, or early interventions before cognitive symptoms emerge. This could lead to better treatment and management of Alzheimer's disease.