A red blood cell (RBC) count measures the number of red blood cells in a sample of blood. It is part of a battery of tests called a complete blood count (CBC) that measures the different types and ...

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 ...

Quiz: Which blood tests matter most for aging adults? Most people know they should get blood work done. Fewer know what each ...