hs-CRP — Normal Range & Interpretation

Clinical Context

High-sensitivity C-reactive protein (hs-CRP) measures low-grade systemic inflammation produced by the liver in response to interleukin-6 signaling. Unlike standard CRP used to detect acute infection or flare, hs-CRP stratifies cardiovascular risk in adults without known heart disease and refines risk estimates alongside lipid panels and ASCVD scoring.

Elevations above 3.0 mg/L signal high cardiovascular risk and also appear with obesity, metabolic syndrome, diabetes, smoking, chronic periodontitis, rheumatologic disease, and estrogen therapy. Values above 10 mg/L reflect acute inflammation or infection rather than vascular risk and require repeat testing after two weeks. Low hs-CRP correlates with lean body mass, regular aerobic exercise, Mediterranean dietary patterns, and statin therapy, which lowers hs-CRP independent of LDL reduction.

FNPs see hs-CRP on the boards most often as a cardiovascular risk marker rather than an infection marker. Expect questions that ask candidates to interpret a borderline ASCVD risk score when hs-CRP exceeds 2.0 mg/L, recognize that values above 10 mg/L indicate acute inflammation and invalidate risk stratification, and identify the need to repeat the test in two weeks before acting on a single elevated result. Items also link hs-CRP reduction to statin initiation and lifestyle counseling in primary prevention.

Related Labs

• HbA1c — %
• ESR — mm/hr
• CRP — mg/dL
• Uric Acid — mg/dL
• Iron (serum) — μg/dL

Sources

• MedlinePlus
• ARUP Consult