White blood cell counts can change for many reasons, including infections, inflammation, physical stress, certain medications, and recovery from illness. Because these cells are a key part of the body's defense system, even temporary changes may reflect how the immune system is responding to different conditions. In some laboratory reports, Immature Granulocytes are also measured to provide additional information about bone marrow activity and immune response. Since blood test results should always be interpreted in the context of a person's symptoms and medical history, it's important to discuss any abnormal findings with a qualified healthcare provider rather than relying on a single value alone.