Quick answer: High-sensitivity C-reactive protein (hs-CRP) is a liver protein that rises with inflammation. It detects low-grade, chronic inflammation and is used alongside cholesterol to help assess heart disease risk. Infections, injuries and intense exercise can raise it temporarily, so a high result is often repeated. Diet, movement, sleep and weight all influence it.
Key takeaways
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hs-CRP is a sensitive blood marker of low-grade inflammation, and it is often read alongside cholesterol when looking at heart health.
A recent cold, an injury or a hard workout can raise it for a while, so a high number is often rechecked once you feel well.
Mediterranean-style meals, regular movement, solid sleep and caring for your gums are the habits most often linked with healthier levels.
hs-CRP can shift for many everyday reasons, so it is most useful when it is read next to your other labs and your history.
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What is hs-CRP?
C-reactive protein is made by the liver in response to inflammatory signals. The high-sensitivity test measures low levels that standard CRP tests miss.
Why hs-CRP matters
hs-CRP is a marker of chronic, low-grade inflammation. It helps assess heart disease risk and tracks the effect of lifestyle changes.
Understanding your result
Reference ranges vary by lab, age and sex. Your provider interprets your result against the lab’s range and your overall picture, rather than chasing a single number. Functional labs are optional. They can be helpful in more complex cases.
What raises hs-CRP
hs-CRP can be raised by a recent infection, injury or intense exercise, and by excess abdominal fat and insulin resistance. Smoking, poor sleep and chronic stress raise it too, as do autoimmune and inflammatory conditions and gum disease.
What affects hs-CRP
hs-CRP is affected by recent illness, body fat, diet, sleep and stress, and hormone therapy.
Ways to support healthy levels
Mediterranean-style eating with vegetables, fish and olive oil is a good foundation (see anti-inflammatory diet), along with regular movement and strength training and seven to nine hours of sleep. Do not smoke, care for your gums, and repeat a high result after you are well.
hs-CRP and healthy aging
Chronic low-grade inflammation, sometimes called inflammaging, is one of the key drivers of aging (see inflammaging). It damages blood vessels, accelerates cellular senescence and disrupts tissue repair. hs-CRP is a simple window into it.
What does the research show about hs-CRP?
hs-CRP is one of the most studied inflammation markers in heart research. In a 2002 study of 27,939 apparently healthy American women followed for an average of eight years, Ridker and colleagues compared hs-CRP with LDL cholesterol. After adjusting for age, smoking, diabetes, blood pressure, and hormone use, women in the highest fifth of hs-CRP had 2.3 times the risk of a first heart attack, stroke, artery procedure, or cardiovascular death compared with the lowest fifth, while the highest fifth of LDL carried 1.5 times the risk. The two markers were barely correlated, and 77% of events happened in women with LDL below 160 mg/dL. The limitation is that this was one cohort of American women with a single baseline sample.
A 2010 pooled analysis in The Lancet by the Emerging Risk Factors Collaboration combined individual data on 160,309 people without vascular disease from 54 long-term studies. Each threefold higher CRP level was linked to a 37% higher risk of coronary heart disease after adjusting for usual risk factors, and to a similar rise in deaths from non-vascular causes. The authors noted that the links depended heavily on other risk factors and inflammation markers, so CRP may be a signal of overall risk rather than a direct cause.
The JUPITER trial, published in 2008, enrolled 17,802 healthy adults with LDL below 130 mg/dL but hs-CRP of 2.0 mg/L or higher and gave them rosuvastatin 20 mg or placebo. The trial was stopped early at a median of 1.9 years. The drug lowered LDL by 50% and hs-CRP by 37%, and major cardiovascular events fell from 1.36 to 0.77 per 100 person-years, although reported diabetes was more common with rosuvastatin. Because the drug lowered both LDL and CRP, the trial cannot show how much benefit came from lowering inflammation itself. hs-CRP is also easily raised by a recent cold, injury, or poor sleep, so a high result is usually rechecked.
When to see a naturopathic doctor
It may be time to see a naturopathic doctor if your hs-CRP is elevated or you have a family history of heart disease. The same is true if you have insulin resistance or weight gain, or autoimmune symptoms.
See a medical provider promptly for chest pain, shortness of breath or fever with severe illness.
hs-CRP at a glance
| Topic | What the article explains |
|---|---|
| What it measures | Low levels of C-reactive protein, a marker of low-grade inflammation |
| Why it is used | Tracking inflammation, heart risk assessment and the effect of lifestyle changes |
| What can affect it | Recent illness, body fat, diet, sleep and stress, and hormone therapy |
| Supportive habits | Mediterranean-style eating, movement, seven to nine hours of sleep, not smoking and gum care |
Questions to bring to your clinician
These questions can help you get the most out of your next visit.
Which of my other results would help put my hs-CRP result in context?
How should I read my hs-CRP alongside the rest of my labs and my symptoms?
How often would it make sense to recheck my hs-CRP in my situation?
Which daily habits or medications could be influencing my hs-CRP before we retest?
Frequently asked questions
What does high hs-CRP mean?
It suggests inflammation and, in healthy people, higher heart risk.
Should I retest a high hs-CRP?
Yes, ideally after any illness has passed.
What lowers CRP naturally?
Healthy eating, exercise, weight loss, good sleep and not smoking.
Is hs-CRP the same as CRP?
It measures the same protein, but detects lower levels.
What is a normal hs-CRP level?
The American Heart Association and the CDC describe commonly used reference bands for hs-CRP in cardiovascular assessment. A result under 1.0 mg/L falls in the lower band, a result from 1.0 to 3.0 mg/L falls in the average band, and a result over 3.0 mg/L falls in the higher band. Values above 10 mg/L are typically linked to an acute infection or injury rather than long-term cardiovascular patterns, so they are usually rechecked after that has passed.
What can cause a high hs-CRP?
Research has linked higher hs-CRP to recent illness or injury, excess abdominal fat, poor sleep, smoking, blood sugar problems, gum disease, and inflammatory conditions. A single high value is best confirmed with a repeat test a few weeks later.
Is there a more reliable way to measure inflammation than hs-CRP?
No single test captures every kind of inflammation, but a few steps make the picture more reliable. Cardiology guidance suggests averaging two hs-CRP results taken about two weeks apart while you are well, and repeating any result above 10 mg/L once a recent illness has passed. Many clinicians also read hs-CRP next to other markers such as a complete blood count, ESR, fibrinogen, ferritin, fasting glucose or A1c, and lipids, along with your history. Research markers like IL-6 and GlycA exist, but they are less widely used.
hs-CRP can shift for many everyday reasons, so it is most useful when it is read next to your other labs and your history.
Book your free 15-minute consult
Prefer to start on your own? Try the free 28-Day Reset for Energy and Focus.
Work with a naturopathic doctor near you
Dr. Kneessi sees patients in person in Odenton and by telehealth anywhere in Maryland. Learn more about visits for Annapolis, Odenton, Crofton, and Severna Park, or read about hormone testing and functional medicine in the area.
You can book a free 15-minute consult, or start with the free 28-Day Reset for Energy and Focus, a short daily email series on sleep, light, movement, and food.
Sources
- Emerging Risk Factors Collaboration (Kaptoge S, et al.). C-reactive protein concentration and risk of coronary heart disease, stroke, and mortality: an individual participant meta-analysis. Lancet 2010. PMID: 20031199. https://pmc.ncbi.nlm.nih.gov/articles/PMC3162187/
- Irwin MR, Olmstead R, Carroll JE. Sleep disturbance, sleep duration, and inflammation: a systematic review and meta-analysis of cohort studies and experimental sleep deprivation. Biol Psychiatry 2016. PMID: 26140821. https://pmc.ncbi.nlm.nih.gov/articles/PMC4666828/
- Machado V, et al. Serum C-reactive protein and periodontitis: a systematic review and meta-analysis. Front Immunol 2021. PMID: 34394107. https://pmc.ncbi.nlm.nih.gov/articles/PMC8355591/
- Koelman L, et al. Effects of dietary patterns on biomarkers of inflammation and immune responses: a systematic review and meta-analysis of randomized controlled trials. Adv Nutr 2022. PMID: 34607347. https://pmc.ncbi.nlm.nih.gov/articles/PMC8803482/
- MedlinePlus: C-Reactive Protein (CRP) Test
- MedlinePlus: Heart Diseases
- Ridker PM, et al. Comparison of C-reactive protein and low-density lipoprotein cholesterol levels in the prediction of first cardiovascular events. N Engl J Med 2002. PMID: 12432042. https://pubmed.ncbi.nlm.nih.gov/12432042/
- Ridker PM, et al. Rosuvastatin to prevent vascular events in men and women with elevated C-reactive protein. N Engl J Med 2008. PMID: 18997196. https://pubmed.ncbi.nlm.nih.gov/18997196/
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
