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Also reported in: ng/L
A normal IL-6 within the reference range means the immune system is not mounting an excessive inflammatory signaling response. IL-6 drives many downstream inflammatory effects — fever, acute-phase protein production, immune cell activation — and a normal level is consistent with these pathways are not being overactivated.
Interleukin-6 is a key inflammatory signaling molecule (cytokine) that coordinates the immune response, drives fever, and triggers the liver to produce acute-phase proteins like CRP and fibrinogen. Undetectable IL-6 means no meaningful immune activation or inflammatory signaling is occurring. This is the ideal resting state for the immune system.
Excellent result. Undetectable IL-6 reflects a calm, appropriately quiet immune system.
IL-6: {{value}} {{unit}} — undetectable (ref: <{{high}})Very low IL-6 means minimal inflammatory cytokine signaling is occurring. The immune system is not mounting a significant response. Low IL-6 is associated with better outcomes across many chronic inflammatory conditions, lower cancer risk, and healthier aging.
Good result. Low inflammatory signaling is protective across multiple disease dimensions.
IL-6: {{value}} {{unit}} — very low (ref: <{{high}})A borderline low IL-6 is within the normal healthy range, indicating no significant immune system activation. IL-6 fluctuates with physical activity (rises briefly with exercise then falls) and minor physiological variation, so values in this range represent the normal baseline state.
No action needed. Healthy inflammatory cytokine level.
IL-6: {{value}} {{unit}} — low normal (ref: <{{high}})A normal IL-6 within the reference range means the immune system is not mounting an excessive inflammatory signaling response. IL-6 drives many downstream inflammatory effects — fever, acute-phase protein production, immune cell activation — and a normal level is consistent with these pathways are not being overactivated.
Normal result. No specific inflammatory concern from this cytokine marker.
IL-6: {{value}} {{unit}} — normal (ref: <{{high}})An optimal IL-6 below 3 pg/mL reflects an appropriately regulated immune response with no excess inflammatory cytokine production. This is associated with the lowest risk of IL-6-driven inflammatory diseases, cancer progression, and metabolic syndrome. Low IL-6 supports healthy insulin sensitivity and cardiovascular health.
Excellent result. Low-inflammatory lifestyle choices — exercise, quality sleep, anti-inflammatory diet — support keeping IL-6 low.
IL-6: {{value}} {{unit}} — optimal (ref: <3.0)A borderline elevated IL-6 suggests mild immune system activation. This can reflect chronic low-grade inflammation from metabolic syndrome, obesity, chronic stress, early autoimmune activity, or subclinical infection. IL-6 at this level begins to have systemic effects including promoting insulin resistance, supporting low-grade inflammatory damage, and priming the liver for increased inflammatory protein production.
Address underlying inflammatory drivers: obesity, poor diet, inadequate sleep, chronic stress, smoking. Reassess in 3–6 months with lifestyle changes.
IL-6: {{value}} {{unit}} — borderline elevated (ref: <{{high}}; borderline: 7–20)A noticeably elevated IL-6 indicates substantial immune system activation and cytokine storm-level inflammatory signaling. High IL-6 is seen in noticeable infections, major autoimmune disease flares, malignancy, surgical stress, noticeable injury, or cytokine release syndrome from immunotherapy. IL-6 drives fever, muscle wasting, liver acute-phase response, and immune cell mobilization at high levels.
Medical evaluation is urgently needed. The underlying cause of noticeably elevated IL-6 must be identified and managed. IL-6 blocking therapy (tocilizumab) is used in specific conditions with very large elevation.
IL-6: {{value}} {{unit}} — elevated (ref: <{{high}}; elevated: >20)A very high IL-6 above 100 pg/mL signals a cytokine storm or noticeable uncontrolled inflammatory response. This level is seen in noticeable sepsis, noticeable COVID-19, macrophage activation syndrome, chimeric antigen receptor (CAR) T-cell therapy reactions, and noticeable autoimmune emergencies. Uncontrolled IL-6 elevation can cause multi-organ dysfunction.
This is a life-threatening inflammatory emergency. Immediate hospital care is required. IL-6 receptor blocking therapy may be indicated alongside treating the underlying cause.
IL-6: {{value}} {{unit}} — very high (ref: <{{high}}; critical: >100)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.