Which blood test includes a white blood cell count as one of its parameters?

The complete blood count (CBC) is a comprehensive blood test that evaluates various components of the blood, and it specifically includes a white blood cell (WBC) count as one of its key parameters. The WBC count is crucial for assessing the immune system's status and helps in diagnosing infections, inflammatory conditions, and hematological abnormalities.

In contrast, a reticulocyte count focuses on measuring the number of immature red blood cells in circulation and does not include white blood cell data. An electrolyte test measures levels of various electrolytes in the blood, such as sodium, potassium, and chloride, but does not assess blood cell counts. The platelet function test evaluates how well platelets are functioning but does not provide information about the white blood cell count or any other blood cells. Therefore, the complete blood count is uniquely positioned as the test that includes the white blood cell count as part of its analysis, making it the correct choice.