Biomarker guide
hs-CRP (mg/L)
High-sensitivity C-reactive protein (hs-CRP) measures low-grade inflammation in the body, detecting levels far below what a standard CRP test can see. People test it because chronic low-level inflammation is associated with cardiovascular risk, and hs-CRP adds a dimension that cholesterol numbers alone do not capture.
Reference ranges
Commonly used adult reference ranges. Labs vary in methodology and cutoffs, interpret your results against your lab report's stated ranges and with your doctor.
Commonly used cutoffs: under 1 mg/L low, 1–3 mg/L average, over 3 mg/L high; acute illness or injury can spike results, so retesting confirms a trend.
| Zone | Range |
|---|---|
| Low | 0–1 mg/L |
| Average | 1–3 mg/L |
| High | 3–10 mg/L |
The importance of hs-CRP
CRP is a protein the liver releases in response to inflammation anywhere in the body.[1] The high-sensitivity assay detects the subtle, chronic elevations, fractions of a milligram per liter, that are associated with atherosclerosis, rather than the large spikes caused by acute infection or injury.
Because any inflammation raises CRP, context matters enormously. A cold, a dental infection, a hard training block, or a recent injury can push hs-CRP up temporarily, so a surprising result is usually rechecked after a few weeks before conclusions are drawn. Persistently elevated values, by contrast, tend to track with visceral fat, smoking, poor sleep, and metabolic dysfunction.[3]
Values under 1 mg/L are associated with lower cardiovascular risk, 1–3 mg/L with average risk, and above 3 mg/L with higher risk.[2] Results above 10 mg/L usually indicate an acute process and call for a retest. A persistently elevated hs-CRP alongside borderline lipids is exactly the kind of combined picture worth discussing with your doctor.
Part of our complete guide to Heart Health Lab Tests — browse every panel and biomarker guide in this hub.
Frequently asked questions
What is a normal hs-CRP level?
Commonly used cutoffs associate hs-CRP below 1 mg/L with lower cardiovascular risk, 1–3 mg/L with average risk, and above 3 mg/L with higher risk. Values above 10 mg/L usually reflect an acute infection or injury rather than chronic inflammation and are typically retested after recovery.
What is the difference between CRP and hs-CRP?
They measure the same protein at different sensitivities. Standard CRP tests detect the large elevations of acute infection and inflammatory disease, while the high-sensitivity assay resolves the small chronic elevations, under 10 mg/L, that are associated with cardiovascular risk.
What can cause a temporarily high hs-CRP?
Almost any inflammatory stimulus: colds and other infections, dental problems, injuries, intense exercise in the preceding days, and flares of inflammatory conditions. Because of this, a single elevated result is usually repeated a few weeks later before it is treated as meaningful.
How can I lower chronic inflammation?
The factors most consistently associated with lower hs-CRP are losing visceral fat, regular moderate exercise, not smoking, adequate sleep, and a diet built around whole foods. Because elevated hs-CRP can also reflect an underlying condition, persistent elevation is worth investigating with your doctor rather than managing blind.
References
- [1] C-Reactive Protein (CRP) Test — MedlinePlus (National Library of Medicine, NIH)
- [2] Assessing Cardiovascular Risk with C-Reactive Protein — Johns Hopkins Medicine
- [3] C-Reactive Protein: Clinical Relevance and Interpretation — StatPearls, NCBI Bookshelf (NIH/NLM)
Reviewed by
Jason August
Founder & Editorial Lead
Jason August is the founder of Metabolic Markers and its parent company, Advancing Development. He has spent his career building and scaling real-world ventures, including as a founding team member at Build-A-Bear Workshop during its growth from startup to global public company, and since then across capital, real estate, adaptive reuse, and hospitality. He founded Metabolic Markers to make blood-biomarker testing easier to understand and access, and oversees the site’s content and editorial accuracy. Jason is not a medical professional; all content on this site is educational, reviewed for accuracy, and never a substitute for advice from a licensed physician.
Panels that measure hs-CRP
Heart Health Blood Test Panels: Tiered Cardiac Risk Screening
Four tiered blood panels that measure markers associated with cardiovascular risk, from a quick baseline to a 94-biomarker deep dive.
View panelCardio IQ Advanced Lipid & Heart Health Testing: ApoB, Lp(a) & More
Advanced lipid, inflammation, and metabolic testing from Quest, a deeper look at cardiovascular markers than a standard cholesterol panel.
View panelHeart Health Blood Test Panels: Lipids, ApoB, hs-CRP & More
Seven cardiovascular panels, from a six-biomarker lipid profile to a 36-biomarker deep dive, currently 20% off.
View panel