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How to Understand Results of a WBC

Levels of white blood cells (WBCs) fluctuate like seesaws not necessarily in tandem. Best interpreted by a physician, your momentary configuration may suggest any of a number of immunological activities and underlying conditions.

  1. Definition

    • The WBC count measures the number of WBCs in a cubic millimeter of blood, according to "Medical-Surgical Nursing." The WBC differential shows the proportion of each type of WBC.

    Types

    • There are five main types of WBCs, according to "Microbiology." These are neutrophils, eosinophils, basophils, monocytes and lymphocytes.

    Functions

    • Produced in the bone marrow, different WBCs perform different immunological functions, according to "Human Physiology." Their numbers and proportions vary depending on such factors as the presence of an infection, a parasite or drugs that suppress bone marrow.

    Overall Number

    • A WBC count above 9,000 could indicate infection, leukemia or tissue death (necrosis). A count below 4,000 could indicate bone marrow depression.

    Proportions

    • A high proportion of neutrophils could suggest a bacterial infection. A low proportion could result from chemotherapy. To interpret WBC findings, consult your physician.

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