The Total White Blood Cell (WBC) Count measures the total number of your infection-fighting white blood cells. Think of it as a count of your body's entire "defense army." A high count is a primary indicator of an active bacterial or viral infection, while a low count can signal an immune system issue. This test is a fundamental part of our Complete Blood Count (CBC) panel. For a complete picture, we recommend the full TLC & DLC (part of the CBC) which not only counts the army but also identifies the different types of soldiers.