A positron emission tomography (PET) scan is a diagnostic tool that examines body tissue functioning, such as blood flow, oxygen use, and sugar metabolism, to help doctors diagnose and treat disease.

Preparing for a blood test involves simple steps to ensure accuracy and comfort. Follow doctor's instructions regarding ...

The night before a military fitness test can be a swirl of emotions. Knowing what to eat -- and, just as importantly, what to avoid -- can add to that anxiety. Here is a question from a reader who is ...