The new app doesn't need a blood test to tell if your hemoglobin levels are low, just an image of your fingernails.

DNA in the blood could tell scientists a person's "biological age," or whether their body functions as older or younger than their actual age.

A molecule that builds up in people with diseases like multiple sclerosis and Parkinson's disease may lead to ways to test for the disease earlier.

The HIVSmart! app increases access to testing and care, especially for at-risk individuals who are unaware of their HIV status.

When there's risk of a viral outbreak, fast diagnosis and treatment are key. A new test could change the time it takes to spot Ebola from days to minutes.

"The mindset of being genetically at risk or protected can alter how we feel, what we do, and—as this study shows—how our bodies respond."

For people with diabetes, fasting before cholesterol tests can pose a major safety risk: an episode of low blood sugar while behind the wheel.

The new easy-to-use device can quickly screen for a variety of diseases including Zika and cancer—and costs less than $1.

Doctors should instead focus on managing the common sexually transmitted infection once it has been diagnosed.

The blood test finds remnants of cancer DNA in the blood stream in order to inform decisions about whether a patient needs chemotherapy after surgery.