Understanding C-Reactive Protein (CRP): Normal vs Optimal Ranges

?What is C-Reactive Protein (CRP)?

C-reactive protein (CRP) is produced by the liver in response to inflammation, infection, or tissue injury. High-sensitivity CRP (hs-CRP) is a more sensitive version of the same test that can detect lower levels of chronic inflammation. CRP is one of the fastest-responding acute-phase proteins — it can rise 1000-fold within 24–48 hours of an acute infection.

!Why It Matters

Hs-CRP below 1 mg/L indicates low cardiovascular risk, 1–3 mg/L is intermediate, and above 3 mg/L is high risk — according to the American Heart Association. The landmark JUPITER trial showed that statin therapy in people with elevated hs-CRP (despite normal LDL) significantly reduced cardiovascular events. CRP is also a general marker of chronic low-grade inflammation — the driver of multiple age-related diseases.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Acutely elevated CRP (>10 mg/L): fever, pain, signs of infection or inflammatory disease
• Chronically mildly elevated CRP (1–10 mg/L): may have no symptoms but indicates smouldering inflammation

How to Improve Your Levels

• 1Anti-inflammatory diet: Mediterranean diet, omega-3 rich foods, colourful vegetables
• 2Exercise regularly — aerobic exercise is potently anti-inflammatory
• 3Lose excess body fat — visceral fat is a major source of inflammatory cytokines
• 4Improve sleep — poor sleep dramatically raises CRP
• 5Quit smoking — tobacco causes chronic systemic inflammation
• 6Address dental health — periodontal disease raises CRP significantly
• 7Omega-3 fatty acids (EPA/DHA): 2–4 g/day lowers CRP
• 8Curcumin (turmeric extract): evidence-based anti-inflammatory

When to Test

For cardiovascular risk assessment, use hs-CRP alongside a lipid panel. Avoid testing during acute illness (cold, flu, dental work) — wait 2 weeks. Annual testing for anyone with metabolic syndrome, obesity, or cardiovascular risk factors.

Related Biomarkers