Leukocytes, commonly known as white blood cells, are your body's defenders. They form an essential part of your immune system, protecting against infections, viruses and other invaders.
What are leukocytes?
White blood cells are produced in your bone marrow and responsible for immune defence. Types include neutrophils (60-70%), lymphocytes (20-40%), monocytes (2-8%), eosinophils (1-4%) and basophils (less than 1%).
Normal values
Normal adult range: 4.0-10.0 x10^9/L. Below 4.0: leukopenia. Above 10.0: leukocytosis. Children have higher values; pregnancy can physiologically elevate levels to 15 x10^9/L.
Elevated leukocytes
Usually indicates your body is fighting something: infections (most common), inflammation, physical stress, smoking or medications like corticosteroids.
Low leukocytes
Reduced immune defence. Causes include viral infections, bone marrow problems, autoimmune diseases, certain medications and severe nutritional deficiencies.
Frequently asked questions
Can stress raise leukocytes?
Yes, acute physical or emotional stress can cause a temporary increase. This normalises quickly.
Do I need to fast?
No, fasting is not required for leukocyte measurement.
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