Following your doctor’s instructions is the most important part of preparing for a blood test. Sleeping well, staying hydrated, and avoiding certain foods and drinks can also provide benefits. Blood ...

Learn about the many tests and examinations your blood sample undergoes in a lab. Giving a blood sample during a doctor’s visit is a common procedure. Discover the dizzying array of automated tests ...

Recent research suggests that blood tests may show markers of oral cancer. But a blood test isn’t enough to confirm an oral cancer diagnosis. A biopsy is the only way to confirm it. Blood tests for ...

Mark Gurarie is a writer covering health topics, technology, music, books, and culture. He also teaches health science and research writing at George Washington University's School of Medical and ...

A personalized blood test known as a circulating tumor DNA (ctDNA) test—which detects tiny fragments of cancer DNA ...