Inflammation markers are substances in the blood that increase when the body is inflamed, and they give a window into a process that otherwise stays hidden. Inflammation itself is not the problem. Short-term, or acute, inflammation is how the body heals from injury and fights infection. The concern is chronic, low-grade inflammation that simmers for months or years, because it is linked to heart disease, diabetes, and other chronic conditions.
A blood test for inflammation can flag that quiet process before symptoms appear. This guide explains which markers matter, what the numbers mean, and the important reasons a single result should be read carefully. Different Health includes inflammation markers in the bloodwork of its DH360+ assessment, reviewed by its medical team and read alongside the rest of your results.
What inflammation markers are
When tissue is injured or the immune system activates, the body produces measurable substances that rise in the blood. Some are proteins made by the liver, others are byproducts of the clotting or immune systems. Measuring them tells you that inflammation is present and roughly how much, though not what is causing it. That is the key limitation to keep in mind: these markers are sensitive but nonspecific.
They are most valuable for detecting inflammation you cannot feel. Chronic low-grade inflammation often produces no clear symptoms, so a marker in the blood may be the first sign that something is worth addressing.
The main blood tests for inflammation
Several markers are used in practice, each suited to a slightly different question. The table below summarizes the common ones.
| Marker | What it reflects |
|---|---|
| High-sensitivity CRP (hs-CRP) | Low-grade systemic inflammation; used for cardiovascular risk |
| Standard CRP | Higher-level inflammation from infection or injury |
| ESR (sedimentation rate) | A general, slower-moving measure of inflammation |
| Homocysteine | An amino acid linked to inflammation and vascular risk |
| Fibrinogen | A clotting protein that rises with inflammation |
| Ferritin | An iron-storage protein that can rise with inflammation |
Common inflammation markers and what they reflect
For long-term health, hs-CRP is the marker that gets the most attention. It measures the same protein as a standard CRP test but with enough sensitivity to detect the small, persistent elevations that ordinary tests miss, which is exactly the range that matters for cardiovascular risk.
In a large cohort of apparently healthy women, hs-CRP was the single strongest predictor of future cardiovascular events, ahead of a full lipid panel.
— Ridker, Circulation, 2001
How to read the numbers
For hs-CRP, the most widely used interpretation comes from the CDC and American Heart Association, which group results into cardiovascular risk bands.
| hs-CRP level | What it suggests |
|---|---|
| Below 1 mg/L | Lower cardiovascular risk |
| 1–3 mg/L | Moderate, or average, risk |
| Above 3 mg/L | Higher risk |
| Above ~10 mg/L | Usually an acute cause such as infection or injury; recheck when well |
hs-CRP cardiovascular risk categories (CDC/AHA criteria)
A level above roughly 10 mg/L generally points to something acute rather than chronic cardiovascular risk, so it is typically rechecked once any illness or injury has resolved. As with any lab value, these bands guide interpretation rather than deliver a verdict, and the result should be read alongside your broader risk picture. This is educational information rather than personal medical advice.
Why one reading isn't enough
The nonspecific nature of these markers is the single most important thing to understand about them. Because C-reactive protein rises with any inflammation, plenty of temporary things push it up without signaling chronic disease. A recent cold, a minor injury, a dental problem, recent surgery, and even a hard workout or long run in the days before your blood draw can all raise CRP.
For that reason, a single elevated result is not a diagnosis. The sensible approach is to test when you are well and rested, avoid intense exercise just beforehand, and repeat the measurement to confirm whether the elevation persists. A marker that stays high across repeat tests, when you are otherwise healthy, is far more meaningful than one high reading. This is where interpretation matters more than the raw number, and where Different Health's team reads your inflammation markers together with your metabolic and body-composition results rather than in isolation.
Chronic inflammation, and what helps
Chronic inflammation symptoms tend to be vague when they appear at all: persistent fatigue, body or joint aches, digestive complaints, low mood, or frequent minor illness. Often there are no symptoms, which is why the blood markers are useful. Much of chronic low-grade inflammation is driven by modifiable factors, and reducing excess visceral fat matters in particular, since that fat is metabolically active and helps fuel the process, a link explored more in our guide to metabolic health.
The measures that lower inflammation are the familiar foundations of good health: a diet built around vegetables, fruit, fiber, and healthy fats, regular physical activity, reaching a healthier body composition, good sleep, not smoking, and managing stress. Because inflammation responds to these changes over time, re-measuring your markers is a practical way to see whether your efforts are working. Different Health measures inflammation markers as part of its DH360+ bloodwork, and its MDs and PhDs use them, alongside the rest of the assessment, to build and adjust a personalized plan.
Key Takeaways
- What they are: inflammation markers are blood substances that rise when the body is inflamed.
- The main one: hs-CRP detects the low-grade inflammation linked to heart disease that standard tests miss.
- The bands: under CDC/AHA criteria, hs-CRP below 1 is lower risk, 1–3 moderate, and above 3 higher.
- Nonspecific: infection, injury, and even hard exercise raise CRP, so one reading isn't a diagnosis.
- Repeat to confirm: a marker that stays high when you're well is what matters.
- Trackable: diet, exercise, losing visceral fat, sleep, and not smoking lower inflammation over time.
Frequently Asked Questions
What are inflammation markers?
Inflammation markers are substances in the blood that rise when the body is inflamed. The most widely used for everyday health is high-sensitivity C-reactive protein, or hs-CRP, a protein made by the liver in response to inflammation. Others include standard CRP, the erythrocyte sedimentation rate, homocysteine, fibrinogen, and ferritin. These markers do not identify what is causing inflammation, only that it is present, so they are used alongside symptoms and other tests rather than on their own.
What blood test shows inflammation?
The most common blood test for inflammation is C-reactive protein. For assessing long-term health, the high-sensitivity version, hs-CRP, is preferred because it detects the low-grade inflammation linked to cardiovascular disease that a standard CRP test would miss. Doctors may also use the erythrocyte sedimentation rate, or ESR, and sometimes homocysteine or fibrinogen. Which test is chosen depends on the question being asked, since some are better for chronic low-grade inflammation and others for acute flare-ups.
What is a normal hs-CRP level?
Under criteria from the CDC and American Heart Association, an hs-CRP below 1 mg/L indicates lower cardiovascular risk, 1 to 3 mg/L indicates moderate or average risk, and above 3 mg/L indicates higher risk. A level above about 10 mg/L usually reflects an acute cause such as an infection or injury rather than chronic risk, and is typically rechecked once you are well. Because the number depends on context, it should be interpreted with a clinician rather than against a single cutoff.
What are the symptoms of chronic inflammation?
Chronic inflammation often produces vague, nonspecific symptoms, which is part of why it can go unnoticed. People may experience persistent fatigue, body or joint aches, digestive issues, low mood, or frequent minor illness, and in many cases there are no obvious symptoms at all. Because chronic low-grade inflammation is linked to conditions like heart disease, diabetes, and other chronic illness, blood markers are useful precisely when symptoms are subtle or absent. Persistent symptoms should be evaluated by a doctor.
What can cause a falsely high inflammation marker?
C-reactive protein is nonspecific, so many temporary things raise it without signaling chronic disease. Recent infection or illness, injury, surgery, and even a hard workout or long run in the days before testing can all elevate CRP. That is why a single high reading is not a diagnosis, and why testing is best done when you are well and rested, then repeated to confirm a trend. A doctor interprets the result alongside your history and other tests.
How can I lower inflammation?
The most effective ways to lower chronic inflammation are the core habits of good health: a diet rich in vegetables, fruit, fiber, and healthy fats, regular physical activity, reaching a healthy body composition, sufficient sleep, not smoking, and managing stress. Reducing excess visceral fat matters in particular, since that fat is metabolically active and drives inflammation. Improvements show up over time and can be tracked by re-measuring your markers. This is general educational information, not personal medical advice.
References
- Ridker PM. High-Sensitivity C-Reactive Protein: Potential Adjunct for Global Risk Assessment in the Primary Prevention of Cardiovascular Disease. Circulation. 2001;103(13):1813–1818.
- Nakhleh A, et al. High-Sensitivity C-Reactive Protein: Reference Range, Interpretation (CDC/AHA risk categories). Medscape / eMedicine.
- Mayo Clinic Laboratories. C-Reactive Protein, High Sensitivity, Serum (HSCRP) — clinical overview.