What does a complete blood count (CBC) primarily evaluate?

A complete blood count (CBC) primarily evaluates blood cell levels and characteristics. This test measures various components of the blood, including red blood cells, white blood cells, and platelets. It provides valuable information about the overall health of a person and can help identify various conditions such as anemia, infection, and many other diseases. By analyzing the number and type of cells, as well as their morphology, healthcare providers can assess a patient's immune status, oxygen-carrying capacity, and blood clotting ability.

The other options focus on different bodily functions. For instance, electrolyte balance pertains to the concentrations of minerals like sodium and potassium in the blood, which are assessed through different tests rather than a CBC. Hormone levels monitor the endocrine system, and fat content in the bloodstream relates to lipid profiles, neither of which is addressed through a CBC.