For example, while the "normal" range for the white blood cell count is around 4.0 to 11.0 billion cells per liter of blood, we found that most people's individual ranges were much narrower, more like ...

Your doctor says everything looks fine, but you still feel terrible. The problem might not be your health but how labs define “normal.” Understanding the difference between normal and optimal could ...

As a lifelong health and fitness enthusiast with 15 years of experience, Rachel MacPherson is passionate about cutting through fads and noise. Her aim is to clearly communicate health information with ...

Aplastic anemia is when your bone marrow can’t make enough healthy blood cells, including red blood cells, white blood cells, and platelets. A CBC measures blood cell levels and is used to diagnose ...

Medically reviewed by Doru Paul, MD Key Takeaways A low platelet count may lead to easy bruising and excessive bleeding. ...

Human immunodeficiency virus (HIV) attacks CD4 cells, which are a small part of the white blood cells. In acute HIV, white blood cell count may drop slightly but still look “normal.” A white blood ...