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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Hematology

Leukocytes in your blood: what high or low levels can mean

A leukocyte (white blood cell) count measures the total number of white blood cells in your blood. White blood cells are a crucial part of your immune system, defending your body against infections, viruses, and other harmful invaders.

Reference Ranges

Female
10^9/l
Low 4 Normal 10 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

What It Measures

This test measures the total concentration of white blood cells (leukocytes) per volume of blood. White blood cells include neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each serving specific immune functions.

Why It Matters

White blood cell counts reflect the overall activity of your immune system. Elevated counts may indicate infection, inflammation, or stress response, while low counts can suggest immune suppression, bone marrow disorders, or the effect of certain medications. Monitoring supports early detection of immune-related conditions.

When to Test

Leukocyte counts are included in a complete blood count (CBC) and may be ordered as part of routine health screening, when infection is suspected, during treatment for conditions affecting the immune system, or to monitor medication side effects.

Symptoms

Low Levels

Frequent or recurring infections, fever, mouth sores, fatigue, slow wound healing, swollen lymph nodes.

High Levels

Fever, body aches, fatigue, sweating, weight loss, signs of active infection or inflammation.

Lifestyle Tips

Support your immune health with regular exercise, adequate sleep, a nutrient-rich diet, and stress management. Practice good hand hygiene to reduce infection risk. Avoid smoking and excessive alcohol consumption.

Frequently Asked Questions

What does a high white blood cell count mean?
A high white blood cell count (leukocytosis) may indicate your immune system is responding to an infection, inflammation, physical stress, or allergic reaction. In some cases, it can be associated with blood disorders. Your healthcare provider will evaluate the result in the context of your symptoms and other tests.
Can exercise affect my white blood cell count?
Yes, intense physical exercise can temporarily raise your white blood cell count as part of the body's normal stress response. This is usually short-lived and not a cause for concern. For the most accurate results, discuss timing of blood draws with your healthcare provider.