Interleukin-8 Blood Test: Meaning, Levels, and Interpretation
Interleukin-8 (IL-8) is a pro-inflammatory cytokine measured in a blood test to assess active inflammation. Normal Interleukin 8 levels are typically 0–62 pg/mL in adults. High IL-8 indicates infection, tissue damage, or chronic inflammation, while low levels are usually normal or reflect suppressed immune activity. This marker helps evaluate immune response and inflammatory conditions.
Contents
Result interpretation Interleukin-8
What your result means based on common reference ranges
Interleukin-8 levels within 0–62 pg/mL reflect baseline immune activity without significant inflammation or infection.
Mildly elevated IL-8 levels suggest low-grade inflammation or localized infection, often seen in early immune response stages.
High IL-8 levels above 150 pg/mL indicate systemic inflammation, severe infection, or cytokine-mediated tissue damage such as sepsis.
Low Interleukin-8 levels are typically normal but may reflect suppressed immune response due to immunosuppressive therapy.
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What is Interleukin-8?
Interleukin-8 is a chemokine involved in the immune system's response to infection and injury. Its main function is to recruit neutrophils to sites of inflammation, making it a key marker of neutrophilic inflammation. In a blood test, elevated IL-8 levels are associated with bacterial infections, sepsis, and chronic inflammatory diseases such as rheumatoid arthritis. Unlike general markers like CRP, IL-8 provides insight into specific immune pathways. Monitoring IL-8 levels helps assess inflammation severity, treatment response, and immune activation patterns in clinical practice.
Reference ranges
Causes of abnormal values
Causes of low Interleukin-8
- • Immunosuppressive therapy: reduces cytokine production and immune signaling
- • Chemotherapy: damages immune cells responsible for cytokine synthesis
- • Severe malnutrition: protein deficiency limits immune molecule production
Causes of high Interleukin-8
- • Bacterial infections: stimulate IL-8 release to recruit neutrophils for pathogen elimination
- • Rheumatoid arthritis: chronic joint inflammation drives continuous cytokine production
- • Sepsis: systemic immune activation causes excessive IL-8 and cytokine storm
- • Smoking: lung irritation induces persistent inflammatory signaling
- • Acute pancreatitis: tissue damage triggers strong inflammatory mediator release
- • Psoriasis: immune dysregulation leads to elevated cytokine-driven skin inflammation
Interleukin-8 in combination with other markers
Possible symptoms
- •Persistent fever
- •Local redness and swelling
- •Fatigue and weakness
- •Joint pain and stiffness
- •Shortness of breath
When to see a doctor
Consult a doctor if Interleukin-8 levels exceed 150 pg/mL or continue rising over time. Seek medical attention if elevated IL-8 is accompanied by fever, joint swelling, or weakness. Urgent evaluation is needed if symptoms suggest systemic infection or sepsis.
What to do if abnormal
- Identify cause with additional tests and clinical evaluation
- Reduce inflammation triggers such as smoking
- Improve nutrition to support immune balance
- Monitor IL-8 trends with follow-up blood tests
- Follow prescribed treatment for underlying conditions
The information on this page is intended for general understanding of test results and does not replace medical consultation. Accurate interpretation requires considering other blood markers and individual factors.
Content is based on medical literature and used within the PulseBook analytical system.
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