Around 80% of people with Down syndrome develop Alzheimer’s disease, often when they are between 40 and 50 years old. A study led by Lund University in Sweden has shown that a simple blood test can detect Alzheimer’s disease in people with Down syndrome with a high degree of certainty. The findings are important for several reasons, not least the ability to make a correct diagnosis without invasive procedures. The study was recently published in JAMA Neurology.