The other 99% of your white blood cells are made up of neutrophils, eosinophils, lymphocytes, and monocytes. Basophils, eosinophils, and neutrophils all contain granules, but basophils have the most.

How do you tell if your body is making enough red blood cells? That’s where a reticulocyte count test comes in. Learn more about how it works and why it’s important.

An RBC count is used to find out how many red blood cells you have. Learn why your doctor might order one, how it’s performed, and what results mean.