Blood tests for Alzheimer's disease can be misleading in people with kidney damage because these patients tend to have higher levels of Alzheimer's biomarkers in their blood, although they do not have an increased overall risk of dementia. The study showed that in people with elevated biomarkers, kidney damage can accelerate when Alzheimer's symptoms appear. The results suggest that the condition of the kidneys affects the interpretation of blood tests for Alzheimer's disease, so doctors should also take kidney function into account when evaluating the results. This approach can help to get a more accurate picture of the patient's condition and avoid misdiagnosis based only on blood biomarker levels. The research highlights the need for a comprehensive assessment of multiple organs in the diagnosis of Alzheimer's disease using blood tests.