What it measures.
High-sensitivity C-reactive protein (hs-CRP) is produced by the liver in response to inflammation anywhere in the body. Unlike regular CRP tests, the high-sensitivity version can detect the low-grade chronic inflammation that drives aging and cardiovascular disease.
hs-CRP measures the blood concentration of C-reactive protein using a highly sensitive assay capable of detecting levels below 1 mg/L. CRP is an acute-phase reactant produced primarily by hepatocytes in response to inflammatory cytokines, especially IL-6.
Why it matters.
Chronic low-grade inflammation, termed 'inflammaging,' is a hallmark of biological aging and underlies most chronic diseases. hs-CRP is a key component of biological age calculations (PhenoAge) and independently predicts cardiovascular events, even when cholesterol is normal. Each doubling of hs-CRP is associated with ~18% higher cardiovascular risk.
Physiology.
When tissue damage or infection occurs, immune cells release inflammatory cytokines (IL-1, IL-6, TNF-α). The liver responds by producing CRP within hours. CRP binds to damaged cells and pathogens, marking them for destruction by the immune system. While this acute response is protective, chronic elevation indicates persistent inflammation from sources like visceral fat, periodontal disease, chronic infections, or autoimmune processes.
Testing & preparation.
How to prepare
- No fasting required
- Avoid testing during acute illness, injury, or infection (wait 2-3 weeks)
- Note recent dental work or vaccinations
- Intense exercise can transiently elevate CRP—rest 24-48 hours before
When to test
Include in annual health screening, especially with cardiovascular risk factors. Essential for biological age assessment.
How often
Annually for screening; every 3-6 months when actively reducing inflammation through lifestyle changes.
Interpretation.
High hs-crp
Common causes:
- Visceral adiposity and metabolic syndrome
- Chronic infections (periodontal disease, H. pylori, hepatitis)
- Autoimmune conditions
- Poor sleep quality or sleep apnea
- Chronic stress
- Smoking
- Diet high in processed foods and sugar
- Sedentary lifestyle
- Acute illness (transient elevation)
Implications:
- Increased cardiovascular disease risk (2-3x at high levels)
- Accelerated biological aging
- Higher all-cause mortality
- Increased risk of type 2 diabetes
- Associated with cognitive decline and dementia risk
- May indicate hidden inflammatory source requiring investigation
Low hs-crp
Common causes:
- Healthy lifestyle with regular exercise
- Anti-inflammatory diet
- Healthy body composition
- Good sleep and stress management
- Some statin therapy
Implications:
- Lower cardiovascular risk
- Slower biological aging
- Better metabolic health
- Reduced all-cause mortality risk
Optimization.
Diet
- Mediterranean diet pattern (reduces hs-CRP 20-40% in studies)
- Increase omega-3 fatty acids from fatty fish (2-3 servings/week)
- Eat abundant colorful vegetables and berries (polyphenols)
- Reduce refined carbohydrates and added sugars
- Limit ultra-processed foods and industrial seed oils
- Add anti-inflammatory spices: turmeric, ginger, garlic
Lifestyle
- Regular aerobic exercise (150+ min/week reduces CRP 20-30%)
- Weight loss—especially visceral fat (5% loss can halve CRP)
- Prioritize sleep quality and duration (7-9 hours)
- Stress management (meditation, yoga shown to lower CRP)
- Quit smoking (CRP drops significantly within weeks)
- Address dental health—treat periodontal disease
- Limit alcohol to moderate intake
Supplements
- Omega-3 (EPA/DHA): 2-4g daily (reduces CRP 10-20%)
- Curcumin: 500-1000mg with piperine (significant CRP reduction in studies)
- Vitamin D: optimize levels to 40-60 ng/mL
- Magnesium: 300-400mg daily (deficiency increases inflammation)
FAQs.
Why is my hs-CRP high if I feel healthy?
Chronic low-grade inflammation often has no symptoms. Common hidden sources include visceral fat (even in 'normal weight' individuals), gum disease, poor sleep, chronic stress, and dietary factors. hs-CRP is valuable precisely because it detects this silent inflammation before disease manifests.
Can exercise temporarily raise hs-CRP?
Yes, intense or prolonged exercise can transiently elevate CRP as part of the acute inflammatory response to muscle damage. This typically normalizes within 24-48 hours. Regular exercise chronically lowers baseline CRP. Test at least 2 days after intense workouts for accurate baseline.
What's the difference between CRP and hs-CRP?
Standard CRP tests measure higher levels (typically >10 mg/L) and are used to detect acute infection or inflammation. hs-CRP uses a more sensitive assay to detect the subtle elevations (0.5-3.0 mg/L) associated with chronic inflammation and cardiovascular risk. For longevity assessment, you need hs-CRP.
How quickly can hs-CRP improve?
hs-CRP can respond quickly to lifestyle changes. Dietary improvements and exercise can reduce CRP within 2-4 weeks. Weight loss shows progressive improvement. However, if levels remain elevated despite lifestyle optimization, investigate underlying sources like chronic infections or autoimmune conditions.
Should I take statins just for high hs-CRP?
The JUPITER trial showed statins benefit people with elevated hs-CRP (>2.0 mg/L) and normal LDL. However, lifestyle interventions should be first-line therapy. Discuss with your physician—if CRP remains elevated despite lifestyle optimization and you have additional risk factors, statin therapy may be appropriate.