Firms like Function Health and Oura market regular blood tests to people wanting to take their health into their own hands. The process often raises more questions for patients than it can answer.

The first Alzheimer's blood test cleared by the Food And Drug Administration is poised to change the way doctors diagnose and treat the disease.

A new generation of blood tests can help diagnose Alzheimer’s disease. But many doctors don’t yet know how to use them.

Convenient as it may be, beware of getting your blood drawn at a hospital. The cost could be much higher than at an independent lab, and your insurance might not cover it all.