WBC is an abbreviation for white blood cell, which refers to white blood cells. White blood cells are mainly found in the blood system and are one of the main components of blood cells, mainly composed of lymphocytes, neutrophils, and eosinophilic monocytes. Leukocytes are immune cells that are responsible for the body’s immune function, fighting off foreign bacteria, pathogens, and parasitic infections. When a patient has an infection, the number of white blood cells increases significantly. The normal white blood cell count is (4.0-10.0) x 10^9/L. When the white blood cell count is elevated, it usually indicates that the patient may have an infection. Therefore, white blood cells are an important part of the body and are one of the important blood cells.