As a rule, younger people need less vitamin D than older people, regardless of sex. This article explains average vitamin D ...

Should we all be concerned about our cortisol levels? I took a blood stress test and spoke with experts to find out.

Medically reviewed by Steffini Stalos, DO A vitamin B12 blood test is a reliable way to determine if you have adequate levels ...

Sarah is an experienced writer and editor enthusiastic about helping readers live their healthiest and happiest lives. Before joining Forbes Health, Sarah worked as a writer for various digital ...

Your blood serves numerous roles to maintain your health. To carry out these functions, blood contains a multitude of components, including red blood cells that transport oxygen, nutrients and ...

If you’ve ever had a doctor order a blood test for you, chances are that they ran a complete blood count, or CBC. One of the most common blood tests in the world, CBC tests are run billions ...

If you could take a simple blood test that could detect multiple types of cancer while they’re still in an early and treatable stage, would you? For many, the answer would be a resounding yes.