A self-administered radiation blood test would take some burden off medical systems after a nuclear attack or disaster.

An algorithm could tell doctors when blood tests are likely to lead to duplicate results, which could save money and reduce the burden on patients.

An Alzheimer's blood test could also help scientists "more efficiently enroll participants in clinical trials, which will help us find treatments faster."

Doctors may one day diagnose Alzheimer's disease with a simple blood test. The new technology, called APEX, detects amyloid beta.

Scientists have uncovered a biomarker for chronic fatigue syndrome. "Too often, this disease is categorized as imaginary."

The test could one day also detect other neurodegenerative conditions such as multiple sclerosis, traumatic brain injury, or stroke.