High-sensitivity C-reactive protein (hsCRP) is a refined biomarker used to detect subtle, low-grade inflammation within the body.
Unlike standard CRP assays, which are primarily suited for acute and pronounced inflammatory responses.
hsCRP enables the measurement of much lower concentrations of C-reactive protein, thereby providing insights into chronic and subclinical conditions.

Biological Role

CRP is an acute-phase protein produced by the liver in response to pro-inflammatory cytokines such as interleukin-6. Its physiological role is linked to host defence, complement activation, and clearance of necrotic and apoptotic cells. hsCRP assays extend the clinical applicability of this protein by allowing quantification at levels previously undetectable with conventional methods.

Measurement Range

• hsCRP can reliably detect concentrations from approximately 0.1 mg/L up to 10 mg/L, covering the spectrum relevant to cardiovascular and metabolic risk assessment
• This sensitivity distinguishes hsCRP from standard CRP, which is more useful in identifying acute bacterial infections, autoimmune flares, or major trauma

Clinical Significance

• Cardiovascular health: Persistent low-grade elevations of hsCRP (e.g. 2–10 mg/L) have been associated with a higher risk of myocardial infarction, stroke, and peripheral arterial disease
• Metabolic disorders: Increased hsCRP levels are often observed in obesity, insulin resistance, and type 2 diabetes, reflecting chronic systemic inflammation
• Autoimmune and chronic conditions: Subclinical rises in hsCRP may point to ongoing inflammatory activity in conditions such as rheumatoid arthritis or inflammatory bowel disease, even when overt symptoms are absent

Interpretation Guidelines

• <1.0 mg/L: Low risk of cardiovascular events
• 1.0–3.0 mg/L: Intermediate risk
• >3.0 mg/L: High risk, though levels above 10 mg/L usually suggest acute infection or trauma and require further diagnostic evaluation

Key Characteristics Summarised

• High analytical sensitivity for low-grade inflammation
• Prognostic value for cardiovascular and metabolic risk
• Complementary role alongside other diagnostic markers
• Rapid and reliable detection through immunoturbidimetric or nephelometric methods