Kidney problems can push Alzheimer’s biomarkers higher in blood tests even when dementia risk doesn’t actually increase. Credit: Shutterstock People with reduced kidney function tend to show higher levels of Alzheimer's biomarkers in their blood, even though their overall risk of dementia does not increase. This finding comes from research published December 3, 2025, in Neurology, the medical journal of the American Academy of Neurology. The study did not demonstrate that poor kidney function