What should I do if my routine blood test shows elevated white blood cell count?

A complete blood count (CBC) with white blood cell (WBC) analysis primarily helps determine whether an infection or leukemia is present. Diagnosis depends on both the degree of WBC elevation and changes in the relative proportions of different WBC subtypes. In a CBC, WBCs are categorized into five major types: neutrophils, lymphocytes, monocytes, eosinophils, and basophils—while the total WBC count represents an overall measure.

What to Do When White Blood Cell Count Is Elevated

An elevated total WBC count accompanied by increased neutrophil percentage typically indicates infection: mild elevation suggests a mild infection, whereas marked elevation often reflects severe infection. In contrast, elevated total WBC count with concurrent increases in lymphocytes and/or monocytes may point to a viral infection. If lymphocyte or monocyte percentages are markedly elevated—for example, lymphocytes >70% or monocytes >20%—peripheral blood smear morphology examination is warranted to rule out hematologic malignancies. Elevated eosinophil or basophil counts are commonly associated with parasitic infections or allergic disorders.

Mild WBC elevation, especially when accompanied by mild neutrophilia, usually signifies a mild infection. If clinical signs of infection are present, antibiotic therapy guided by a physician is generally effective. However, significantly abnormal WBC elevation raises strong suspicion for leukemia, necessitating further evaluation—including peripheral blood smear morphology assessment and/or bone marrow aspiration and biopsy—for definitive diagnosis. Confirmed leukemia requires chemotherapy. For parasitic infections or allergic conditions, targeted antiparasitic or antiallergic treatment is indicated.

Dietary recommendations should be tailored according to the underlying diagnosis. For mild infections, while undergoing antibiotic therapy, patients should rest adequately and consume high-protein foods such as beef, fish, chicken, and duck. However, fatty or greasy foods should be avoided, as they may impair immune function during infection. In cases of confirmed leukemia, dietary management must be conducted under medical supervision; in certain circumstances, high-protein diets may need to be restricted.

We hope the above information is helpful to you. Wishing you good health and happiness!