A finger-prick blood sample taken at home and posted to a lab, paired with cognitive tests completed online, could one day flag who is at greatest risk of developing dementia. That is the conclusion of a study led by the University of Exeter and published in Nature Communications, which found that levels of dementia-linked proteins in the postal blood samples corresponded with how people performed on a battery of brain tests.
The practical appeal is obvious. Current routes to assessing dementia risk typically involve clinic visits, specialist scans or lumbar punctures - all expensive, slow, and out of reach for many people. A test kit that arrives in the post and a set of cognitive tasks completed on a home computer sidesteps most of that friction, which matters as much for research recruitment as it does for individual patients.
The researchers, funded by the National Institute for Health and Care Research Exeter Biomedical Research Centre, frame the approach as a triage tool rather than a diagnosis. People identified as high risk could be prioritised for further testing, treatment and support; those at low risk could be reassured; and people in the middle could be monitored or offered guidance on reducing their risk over time.
Professor Anne Corbett of the University of Exeter Medical School, who led the work, said earlier research had already established that finger-prick samples can be collected at home, posted to labs, and analysed for dementia-related biomarkers. This study extends that by connecting those biomarkers to cognitive performance. The word the team uses is "potential" - linking blood proteins to test scores is a step towards predicting risk, not proof that the combination can reliably forecast who will go on to develop dementia.