WBC: What It Means for Your Health
White blood cells (leukocytes) are the soldiers of your immune system, defending your body against bacteria, viruses, fungi, and other invaders. The WBC count measures the total number of these cells in your blood. A differential count breaks them into subtypes (neutrophils, lymphocytes, monocytes, eosinophils, basophils). Changes in WBC count can signal infection, inflammation, immune disorders, or bone marrow problems.
Reference Range
Reference ranges may vary between laboratories, age groups, and sexes. The values shown are general adult reference ranges. Always compare your results to the specific range provided by your testing laboratory.
What Is WBC?
White blood cells (leukocytes) are the soldiers of your immune system, defending your body against bacteria, viruses, fungi, and other invaders. The WBC count measures the total number of these cells in your blood. A differential count breaks them into subtypes (neutrophils, lymphocytes, monocytes, eosinophils, basophils). Changes in WBC count can signal infection, inflammation, immune disorders, or bone marrow problems.
Commonly included in:
What Does High WBC Mean?
Elevated WBC (leukocytosis) commonly indicates an active infection (bacterial, viral, or fungal), physical or emotional stress, inflammatory conditions (such as rheumatoid arthritis), allergic reactions, or leukemia. Certain medications like corticosteroids can also raise WBC. Temporary elevation is normal after intense exercise or during pregnancy.
What Does Low WBC Mean?
Low WBC (leukopenia) can result from viral infections (like HIV or hepatitis), autoimmune disorders (like lupus), bone marrow damage from chemotherapy or radiation, severe infections that overwhelm the immune system, or certain medications. It increases susceptibility to infections.
Related Biomarkers in Hematology
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This information is for educational purposes only and is not intended as medical advice, diagnosis, or treatment. Reference ranges may vary between laboratories. Always consult a qualified healthcare professional for interpretation of your blood test results and before making any health decisions.