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Also reported in: mg/dL
A normal CRP within the accepted reference range means no significant acute inflammatory process is currently detected. CRP can rise within hours of an infection or inflammatory injury and returns to baseline within days to weeks. A normal CRP helps rule out major acute inflammation, though chronic low-grade inflammation can exist with CRP in the low-normal range.
C-reactive protein is the body's main general inflammation concern signal, produced by the liver in response to any significant inflammatory stimulus. An undetectable CRP means no measurable inflammatory process is currently active — no active infection, autoimmune flare, or significant tissue injury. This is the ideal resting state.
Excellent result. Maintain anti-inflammatory lifestyle habits to keep inflammation at bay.
CRP: {{value}} {{unit}} — undetectable (ref: <{{high}})A low CRP means no significant inflammatory process is detectable. The immune system is not mounting an active inflammatory response at this time. Low CRP is associated with lower risk of inflammatory disease flares, lower cardiovascular risk, and better metabolic health outcomes.
Good result. Low CRP indicates a quiet immune system and low inflammatory burden.
CRP: {{value}} {{unit}} — low (ref: <{{high}})A borderline low CRP is within the healthy range and indicates minimal systemic inflammatory activity. At this level, the body's inflammatory response is not noticeably activated. This is a favorable result for overall immune and metabolic health.
No action needed. Maintain anti-inflammatory diet and lifestyle.
CRP: {{value}} {{unit}} — low normal (ref: <{{high}})A normal CRP within the accepted reference range means no significant acute inflammatory process is currently detected. CRP can rise within hours of an infection or inflammatory injury and returns to baseline within days to weeks. A normal CRP helps rule out major acute inflammation, though chronic low-grade inflammation can exist with CRP in the low-normal range.
Normal result. Consider high-sensitivity CRP testing for cardiovascular risk assessment if relevant.
CRP: {{value}} {{unit}} — normal (ref: <{{high}}; up to 3 mg/L)An optimal CRP below 1.0 mg/L reflects the lowest inflammation burden, associated with the least immune system activation against the body's own tissues or against chronic low-grade threats. This level is associated with the best metabolic, cardiovascular, and inflammatory disease outcomes.
Excellent result. Anti-inflammatory lifestyle choices are reflected in this optimal CRP.
CRP: {{value}} {{unit}} — optimal (ref: <1.0)A borderline elevated CRP between 3 and 10 mg/L indicates mild to moderate active inflammation. This range spans many common may contribute to: active minor infection, autoimmune disease in low-grade activity, inflammatory bowel disease in remission, recent injury, chronic metabolic inflammation, or periodontal disease. This level requires interpretation in context of symptoms and other markers.
Discuss with your doctor. Identify and address potential inflammatory triggers — infection, diet, autoimmune conditions, dental health, or metabolic syndrome.
CRP: {{value}} {{unit}} — borderline elevated (ref: <{{high}}; borderline: 3–10)A CRP between 10 and 100 mg/L represents a significant active inflammatory process. This level is seen in bacterial infections, autoimmune flares (rheumatoid arthritis, lupus, IBD), significant tissue injury, major surgery, or systemic inflammatory disease. CRP at this level reliably indicates that the immune system is mounting a meaningful response.
Medical evaluation is needed. The source of inflammation should be identified and treated. CRP at this level warrants investigation to rule out serious infection or autoimmune disease.
CRP: {{value}} {{unit}} — elevated (ref: <{{high}}; elevated: 10–100)A CRP above 100 mg/L represents very large, life-threatening inflammation. This level is characteristically seen in serious bacterial infections, sepsis, noticeable autoimmune crises, bacterial arthritis, or major organ inflammation. CRP above 200 mg/L is almost exclusively associated with serious bacterial infection or noticeable inflammatory disease. At this level, the immune system is in a full-scale emergency response.
This needs urgent medical attention. Seek hospital care immediately. Critical CRP elevation requires urgent identification of the source of inflammation and immediate treatment.
CRP: {{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.