My husband's WBC count was 21.9. What does that mean?

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Hi. Do you have any symptoms? The normal number of WBCs in the blood is 4,500 to 11,000 WBCs per microliter (4.5 to 11.0 × 10^9/L). Normal value ranges may vary slightly among different labs. An increase in white blood cells is known as leukocytosis. It typically occurs in response to the following conditions:

  • infection
  • immunosuppression
  • medications, including corticosteroids
  • a bone marrow or immune disorder
  • certain cancers, such as acute or chronic lymphocytic leukemia
  • inflammation
  • injury
  • emotional stress
  • labor
  • pregnancy
  • smoking
  • allergic reactions
  • excessive exercise