Scientists are exploring a breakthrough diagnostic approach that could one day allow a simple nasal swab to detect early signs of Alzheimer’s disease—years before symptoms like memory loss appear.
In a recent study led by researchers at Duke University, scientists tested whether cells collected from deep inside the nose could reveal biological changes linked to Alzheimer’s. The nasal cavity contains olfactory neurons, which are closely connected to the brain and are often affected in the earliest stages of the disease.
Using a swab similar to those widely used during the COVID-19 pandemic, researchers collected nerve and immune cells and analyzed their gene activity. They identified dozens of genes that behaved differently in people with Alzheimer’s compared to healthy individuals.
In a small trial involving 22 participants, the test was able to distinguish between healthy individuals and those with early or advanced Alzheimer’s with about 81% accuracy. Importantly, it detected changes even in people who had no visible symptoms but showed early biological markers of the disease.
Experts say this method could offer a faster, less invasive, and more accessible alternative to current diagnostic tools such as brain scans or spinal fluid tests. Early detection is crucial, as treatments are believed to be more effective before significant brain damage occurs.
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However, researchers caution that the findings are still preliminary. Larger studies are needed before the nasal swab can be used routinely in clinics. If validated, the test could transform how Alzheimer’s is diagnosed and potentially open the door to earlier intervention and improved patient outcomes.
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