What does a WBC differential measure?

A WBC differential measures the percentage of different types of white blood cells (WBCs) present in the blood. This test is essential for understanding the immune response and can help in diagnosing various conditions, including infections, allergies, and hematological disorders. The WBC differential typically includes counts of lymphocytes, neutrophils, monocytes, eosinophils, and basophils, providing critical insights into a person's health status.

Options that focus on aspects unrelated to white blood cells, such as the rate of RBC destruction, total blood volume, or hemoglobin concentration in RBCs, do not pertain to a WBC differential. Each of those measurements refers to different components or characteristics of blood, but they do not provide information specifically about white blood cells, which is the focus of the WBC differential.