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High-Sensitivity CRP (hsCRP) - Definition & Values

High-sensitivity CRP (hsCRP) is a blood marker used to detect low-level inflammation in the body and assess cardiovascular risk at an early stage.

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Things worth knowing about "High-sensitivity CRP"

High-sensitivity CRP (hsCRP) is a blood marker used to detect low-level inflammation in the body and assess cardiovascular risk at an early stage.

What is high-sensitivity CRP?

High-sensitivity C-reactive protein (hsCRP or hs-CRP) is a refined version of the standard CRP blood test that detects very low levels of inflammation with greater precision. While the conventional CRP test is primarily used to identify acute infections and inflammatory conditions, the hsCRP test can measure even subtle, chronic low-grade inflammation. C-reactive protein is a protein produced by the liver that rises in response to inflammation anywhere in the body.

Clinical significance

The hsCRP test has become an established biomarker for cardiovascular risk assessment. Research shows that even mildly elevated hsCRP levels are associated with a higher risk of heart attack, stroke, and other cardiovascular diseases. The test is also used in evaluating chronic inflammatory conditions, metabolic disorders, and the metabolic syndrome.

Measurement and reference values

hsCRP is measured from a standard blood sample and reported in milligrams per litre (mg/l). The American Heart Association (AHA) and the Centers for Disease Control and Prevention (CDC) recommend the following classification for cardiovascular risk assessment:

Low risk: hsCRP below 1.0 mg/l
Average risk: hsCRP between 1.0 and 3.0 mg/l
High risk: hsCRP above 3.0 mg/l

Values above 10 mg/l typically indicate an acute infection or inflammatory disease and must be investigated separately. In such cases, the hsCRP result is not valid for cardiovascular risk assessment.

Causes of elevated hsCRP levels

Persistently mildly elevated hsCRP levels can result from a variety of factors:

Chronic inflammation (e.g., periodontitis, inflammatory bowel disease)
Overweight and obesity
Smoking
High blood pressure
Diabetes mellitus and insulin resistance
Physical inactivity
Unhealthy diet
Sleep deprivation and chronic stress

Diagnosis and use

The hsCRP test is commonly used as part of a preventive cardiovascular health check, particularly for individuals at intermediate cardiovascular risk where other markers such as cholesterol or blood pressure alone do not provide a clear picture. It is not intended as a standalone diagnostic tool but is always interpreted together with other clinical findings and laboratory values.

Treatment and measures for elevated hsCRP

Since elevated hsCRP levels are typically the result of an unhealthy lifestyle or an underlying condition, management focuses on addressing the root cause:

Weight loss in cases of overweight or obesity
Regular physical activity (at least 150 minutes of moderate exercise per week)
Smoking cessation
Dietary changes towards an anti-inflammatory diet (e.g., Mediterranean diet)
Optimal management of blood pressure, blood sugar, and blood lipids
Stress management and adequate sleep
In certain cases: pharmacological therapy (e.g., statins)

References

Pearson T.A. et al. - Markers of Inflammation and Cardiovascular Disease. Circulation, 2003; 107(3): 499-511.
World Health Organization (WHO) - Cardiovascular diseases (CVDs). Fact Sheet, 2021. Available at: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds)
Ridker P.M. - High-Sensitivity C-Reactive Protein: Potential Adjunct for Global Risk Assessment in the Primary Prevention of Cardiovascular Disease. Circulation, 2001; 103(13): 1813-1818.

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