Home › Lab markers › CRP (C-Reactive Protein)
NUTRIENTS & INFLAMMATION
Also printed as: C-reactive protein · hs-CRP · High-sensitivity CRP
Educational only — not medical advice.
CRP is a protein your liver releases when inflammation is present anywhere in the body. It rises within hours and falls quickly once the trigger resolves. It shows that something is happening, not what or where.
CRP is a general signal, so it is only meaningful with context. Because it responds so fast to everyday events, trends across quiet periods say far more than a single reading.
TYPICAL ADULT RANGE
Many labs report under 3 mg/L on a high-sensitivity test as expected for adults, with under 1 mg/L considered low. Standard CRP tests use different scales. Ranges vary by lab. Reported in mg/L.
Reference ranges vary by lab, by method, and by age and sex. Always read your own result against the range printed on your report.
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A low CRP simply means little general inflammation was detectable at the moment of the draw. It is a reassuring, unremarkable result and needs no follow-up on its own. It does not rule anything out — it just means this particular signal was quiet that day.
A raised CRP most often reflects something ordinary and temporary: a cold, a healing injury, a dental issue, a recent hard workout, or poor sleep. Extra body weight, smoking, pregnancy, and estrogen-containing medications also raise it, as do many chronic inflammatory conditions. Because a single elevated value so often tracks a passing event, clinicians usually repeat it after a couple of quiet weeks. A CRP that stays up when you feel well is a reasonable thing to bring to your doctor, who will read it alongside your ESR and the rest of your picture.
Your doctor is the one who can read this number against your history, symptoms, and medications.
Educational only — not medical advice. Lab results only mean something alongside your history, symptoms, medications, and the rest of your panel. Bring questions to your doctor; they are the one who can interpret your results for you.
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