hs-CRP (High-Sensitivity C-Reactive Protein)
| Clinical | Optimal | |
|---|---|---|
| Male | 0.0 - 5.0 mg/L | <1.0 mg/L (low cardiovascular risk) |
| Female | 0.0 - 5.0 mg/L | <1.0 mg/L (low cardiovascular risk) |
What is hs-CRP (High-Sensitivity C-Reactive Protein)?
High-sensitivity C-reactive protein (hs-CRP) is a protein produced by your liver in response to inflammation anywhere in your body. The 'high-sensitivity' part of the name refers to the laboratory method used — it can detect very small amounts of CRP that a standard test would miss.
Think of hs-CRP as a general alarm system. When your immune system detects a problem — an infection, tissue damage, or chronic irritation — your liver ramps up CRP production. The level in your blood reflects how much inflammation is currently active.
Unlike many markers that point to a specific organ, hs-CRP is a systemic indicator. It does not tell you where the inflammation is, but it tells you that something, somewhere, is triggering your immune system.
Why hs-CRP (High-Sensitivity C-Reactive Protein) Matters for Your Health
Chronic low-grade inflammation is now recognised as one of the key drivers of ageing and age-related disease. Even slightly elevated hs-CRP levels, sustained over years, have been strongly linked to increased risk of heart attack, stroke, type 2 diabetes, and certain cancers.
For cardiovascular risk assessment, hs-CRP adds valuable information beyond standard cholesterol tests. Someone with normal cholesterol but elevated hs-CRP may still carry significant heart risk. This is why longevity-focused clinicians consider it a core biomarker.
Tracking hs-CRP over time provides a window into how effectively your lifestyle is managing inflammation. Diet changes, exercise, weight management, and stress reduction can all meaningfully lower this marker.
hs-CRP (High-Sensitivity C-Reactive Protein)& Your Wearable Data
High-sensitivity C-reactive protein (hs-CRP) is the gold standard blood marker for systemic inflammation and an independent predictor of cardiovascular events. Wearable data provides critical context: acute exercise causes a transient hs-CRP spike that peaks 24-48 hours post-exercise. Your wearable's exercise log helps determine whether an elevated result reflects recent training rather than chronic inflammation.
Chronic overtraining, identifiable through wearable patterns of declining HRV, elevated resting heart rate, poor sleep quality, and reduced performance, is associated with persistently elevated hs-CRP. If your wearable shows these overtraining indicators alongside elevated hs-CRP, reducing training load and improving recovery may be more appropriate than medical investigation.
Regular moderate exercise tracked by your wearable is one of the most effective interventions for lowering chronic hs-CRP. Studies show that consistent activity of 150+ minutes per week at moderate intensity reduces hs-CRP by 20-30% over several months. Your wearable's weekly activity summaries help track whether you are meeting the exercise thresholds associated with lower systemic inflammation.
What High hs-CRP (High-Sensitivity C-Reactive Protein) May Suggest
Elevated hs-CRP suggests your body is dealing with some degree of inflammation. Results between 1.0 and 3.0 mg/L indicate moderate cardiovascular risk, while results above 3.0 mg/L suggest higher risk — though a single high reading should always be confirmed with a repeat test.
Common causes of mildly elevated hs-CRP include carrying excess body fat (especially visceral fat around the middle), poor sleep, chronic stress, smoking, a diet high in refined sugars and processed foods, and sedentary behaviour. Recent infections, dental problems, or autoimmune conditions can also raise it.
If your result is above 10 mg/L, this usually points to an acute infection or significant inflammatory process rather than chronic low-grade inflammation. Your GP may wish to investigate further to identify the source.
What Low hs-CRP (High-Sensitivity C-Reactive Protein) May Suggest
Low hs-CRP is excellent news — it suggests minimal systemic inflammation and is associated with lower cardiovascular risk. Results below 1.0 mg/L are considered optimal from a longevity perspective.
Very low readings typically reflect a healthy lifestyle with good dietary habits, regular physical activity, healthy body composition, and effective stress management. Some people are also genetically predisposed to lower inflammatory responses.
There is no clinical concern with a low hs-CRP. It is one of the few biomarkers where lower is unequivocally better in terms of long-term health outcomes.
How to Optimise Your hs-CRP (High-Sensitivity C-Reactive Protein)
Food
Adopt a Mediterranean-style diet rich in oily fish (salmon, mackerel, sardines), extra virgin olive oil, leafy greens, berries, nuts, and whole grains. Reduce processed foods, refined sugar, and seed oils high in omega-6. Include anti-inflammatory spices like turmeric and ginger regularly. Eat plenty of fibre from vegetables, legumes, and oats, which supports gut health and reduces systemic inflammation.
Lifestyle
Achieve and maintain a healthy body composition — visceral fat is one of the strongest drivers of chronic inflammation. Exercise regularly with a mix of moderate aerobic activity and resistance training. Prioritise 7–9 hours of quality sleep per night. Manage chronic stress through mindfulness, breathwork, or time in nature. Stop smoking if applicable — tobacco is a potent inflammatory trigger. Limit alcohol to moderate levels.
Supplements
Omega-3 fish oil (2–3g EPA/DHA daily) has good evidence for reducing hs-CRP. Curcumin (turmeric extract with piperine for absorption) has demonstrated anti-inflammatory effects in clinical trials. Vitamin D supplementation may help if levels are suboptimal, as deficiency is associated with higher inflammation.
When to Speak to Your GP
See your GP if hs-CRP is persistently above 3.0 mg/L on two or more tests separated by at least two weeks. Seek prompt review if hs-CRP is above 10 mg/L, as this may indicate an acute infection or significant inflammatory condition requiring investigation. Also consult your GP if elevated hs-CRP is accompanied by unexplained fatigue, joint pain, or fever.
References
- NHS. Cardiovascular disease — Prevention. Updated 2024. nhs.uk
- AHA. Ridker PM. C-reactive protein: a simple test to help predict risk of heart attack and stroke. Circulation. 2003;108(12):e81-85. pubmed.ncbi.nlm.nih.gov
- NEJM. Ridker PM, et al. Rosuvastatin to prevent vascular events in men and women with elevated C-reactive protein (JUPITER). N Engl J Med. 2008;359(21):2195-2207. pubmed.ncbi.nlm.nih.gov
- Lancet. Emerging Risk Factors Collaboration. C-reactive protein concentration and risk of coronary heart disease, stroke, and mortality. Lancet. 2010;375(9709):132-140. pubmed.ncbi.nlm.nih.gov
Medical Disclaimer— This content is for general educational and informational purposes only. It does not constitute medical advice, diagnosis, or treatment. Omniwo Ltd is a wellness information service and is not a medical device, clinical laboratory, or regulated healthcare provider under MHRA guidelines. The “optimal ranges” presented on this page are based on published clinical guidelines (WHO, NICE, NHS) and peer-reviewed research; they represent functional wellness targets and may differ from standard laboratory reference ranges. Individual results should always be interpreted by a qualified healthcare professional (such as your GP) who understands your full medical history. Do not start, stop, or change any medication or supplement based solely on this information. If you are experiencing symptoms, seek medical attention promptly.