Which of the following tests is not included in a routine CBC?

• A. Reticulocyte count
• B. Total WBC count
• C. Total protein
• D. Differential WBC count

Answer: (A)

A routine CBC focuses on the cellular components of blood—how the red and white cells and platelets look and behave. Counting reticulocytes, which are immature red blood cells, requires a special test and a specific staining method to assess bone marrow response to anemia. Because this is a specialized assessment rather than a basic cell-count component, it isn’t part of a standard CBC. That’s why reticulocyte count is the best choice for the item that is not included in a routine CBC. The other options are typically covered by a CBC: total white blood cell count and the differential reflect the white cell population and its composition, while total protein is usually measured in separate serum/chemistry workups rather than a CBC.