A blood test that can tell if you have cancer? A flurry of such tests that look for multiple cancers with a prick are in various stages of development. The one that is furthest along, Galleri, was ...

Chronic fatigue, unexplained weight loss or gain, infertility, and hair loss can all signal a hormonal imbalance. You might consider a hormone test if you’re experiencing these or more. Hormone tests ...

Immunoglobulins (antibodies) are Y-shaped proteins made by plasma cells that help fight infection. They neutralize invaders, tag them for macrophages, and trigger other immune responses. Each antibody ...

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