Worldwide, 1 in 4 people will suffer from a depressive episode in their lifetime. A new blood test may lead to a more personalized approach to treatment.

A blood test can predict—within a day of a hospital admission—which patients with COVID-19 are at highest risk of severe complications or death.

A simple blood test that doesn't require overnight fasting could identify youth at risk for developing type 2 diabetes later in life.

Newly discovered cells in the blood seem to indicate impending flare-ups of rheumatoid arthritis. Could they one day be a gauge of pain to come?

A new blood test accurately detects a protein that indicates Alzheimer's disease, researchers say. It may change the way we diagnose and treat the disease.

A new blood test can safely detect 26 undiagnosed cancers, according to a study of more than 9,000 women.

A blood test may offer a way to detect the most common form of pancreatic cancer while still in its early stages, a new study shows.

A new "scorecard" that looks at 29 different genes could be a tool to improve cancer diagnosis. It may also help predict patient survivability.

When tested with people with easy-to-access veins, a blood-drawing robot had a 97% success rate. That's just as good and even better than phlebotomists.

Artificial intelligence can check blood samples to predict and explain the progress of neurodegenerative diseases like Alzheimer's, researchers report.