Scientists have created a new blood test that may help doctors find Alzheimer’s disease before symptoms appear. Alzheimer’s is a type of dementia that affects memory and thinking. Many people around the world have this condition, and early diagnosis is difficult because it often develops slowly.

The blood test works by measuring certain proteins in the blood. These proteins are linked to Alzheimer’s disease, and changes can be found years before strong memory problems begin. The new test is simpler and less expensive than brain scans or other tests currently used.

Researchers say early detection can help patients start treatment sooner and plan for the future. More studies are needed before the test can be used everywhere. Health groups have praised this development and expect earlier diagnosis will improve care for people with Alzheimer’s disease.