Inflammation
What does high hs-CRP mean?
The short answer
hs-CRP (high-sensitivity C-reactive protein) is a blood test that measures small amounts of CRP, a protein the liver releases when there is inflammation. Under AHA and CDC categories, below 1 mg/L means lower cardiovascular risk, 1 to 3 mg/L average risk and above 3 mg/L higher risk. A result above 10 mg/L usually reflects a recent infection, injury or other acute inflammation and is normally repeated.
What hs-CRP measures
C-reactive protein (CRP) is made by the liver. Its level rises when there is inflammation anywhere in the body, but the test cannot say where the inflammation is or what caused it. CRP reacts fast: it can climb to 1,000 times its baseline within hours of an infection or injury, then fall just as quickly.
The high-sensitivity (hs) version detects much smaller amounts, down to about 0.1 mg/L. That matters because subtle, persistent inflammation is tied to cardiovascular risk, so hs-CRP is read alongside cholesterol, blood pressure, blood sugar and smoking history.
hs-CRP ranges
These cardiovascular risk categories were set by the American Heart Association (AHA) and the US Centers for Disease Control and Prevention (CDC).
| Result | Range |
|---|---|
| Lower risk | Below 1.0 mg/L |
| Average riskSome sources call this moderate risk | 1.0 to 3.0 mg/L |
| Higher riskUsually confirmed with a repeat test about two weeks later | Above 3.0 mg/L |
| Likely acute illness or injuryNot used to judge heart risk; repeated once well | Above 10 mg/L |
These categories apply to the hs-CRP test, reported in mg/L. A standard CRP test is sometimes reported in mg/dL instead, so check the units on your report. CRP runs slightly higher in women, older adults, late pregnancy and people taking oral contraceptives or hormone therapy. Reference ranges vary between laboratories, and the range printed on your own report takes priority. Ranges vary between laboratories, and the range printed on your own report takes priority.
What a high hs-CRP result means
A result above 3 mg/L puts you in the higher cardiovascular risk group, but one reading is not enough. CRP swings with any short-term inflammation, so a high result is usually confirmed with a second test about two weeks later, when you are free of any cold, infection or injury. A confirmed result is read alongside your other heart risk factors, not on its own.
Above 10 mg/L, the result usually reflects a recent infection, injury or other acute inflammation rather than long-term heart risk, so it is not used to judge cardiovascular risk. It is normally repeated once you are well. A result that stays above 10 mg/L with no clear cause needs your doctor to find the source.
Common causes
- Recent infection, viral or bacterial
- Recent injury or major trauma
- Autoimmune and inflammatory conditions, such as rheumatoid arthritis, lupus or inflammatory bowel disease
- Obesity and diabetes
- Smoking
- Gum disease
- Insomnia and depression
- Strenuous exercise shortly before the test
What a low hs-CRP result means
A low hs-CRP is good news. Below 1 mg/L is the lowest cardiovascular risk group, and having too little CRP causes no problems. It does not rule out every kind of inflammation, though. Rheumatoid arthritis and lupus do not always raise CRP, statins can lower it, and a low result does not cancel out other risk factors such as a high LDL cholesterol.
What moves hs-CRP
Nutrition
A Mediterranean-style diet, built on vegetables, fruit, pulses, whole grains, fish and olive oil, has shown particular benefit for inflammation and cardiovascular risk. Losing excess weight helps too, because obesity is linked to a higher CRP.
Training
Regular exercise helps bring hs-CRP down over time. A single hard session does the opposite in the short term, so training timing matters on test day.
Sleep and stress
Insomnia and depression are both linked to a higher CRP, which makes sleep and mood part of the plan rather than an extra.
Habits
Quitting smoking is one of the clearest levers. Treating gum disease and keeping blood pressure and cholesterol under control also help.
How fast hs-CRP can change
CRP reacts within hours, rising sharply after an infection or injury and falling just as fast afterwards, so single readings are noisy. Your baseline, the level you sit at when well, follows slower things: weight, fitness, smoking, sleep and blood pressure. When those change and stay changed, the baseline can shift. A Day 90 re-test is a fair window to see the direction of travel, provided you are well on both test days.
Before your test
- Recent illness or injury can push hs-CRP well above 10 mg/L. Test when you have been well for about two weeks.
- Intense weight training or a long run can cause a sudden jump in CRP. Keep the days before your test light.
- Statins can lower CRP; hormone therapy, oral contraceptives and late pregnancy can raise it; NSAIDs such as ibuprofen and magnesium supplements can affect it. Tell your doctor what you take, and do not stop any prescribed medicine without talking to them first.
- No fasting or special preparation is needed.
When to speak to your doctor
Speak to your doctor if your hs-CRP is above 3 mg/L on a repeat test, so it can be read with the rest of your heart risk profile. Speak to them promptly if it is above 10 mg/L with no obvious cause, or stays above 10 mg/L on a repeat test. Get urgent medical help if a high result comes with fever and feeling very unwell, chest pain, breathlessness or severe new pain.
On the Wolfburgh panel
hs-CRP (High-Sensitivity C-Reactive Protein) is one of the 17 markers on the Wolfburgh blood panel. Your sample is collected at home with RedDrop One, an FDA-cleared collection device, and a licensed physician reviews every panel before your care team sees it.
The Partner Physician reads hs-CRP alongside LDL, HDL, triglycerides and HbA1c, because inflammation adds to the heart risk those markers describe. The Nutritionist, Trainer and Behaviour Specialist work on the levers behind a raised baseline: diet pattern, body weight, training, sleep and smoking. Members re-test at Day 90, backed by the 90-Day Results Guarantee.
Common questions about hs-CRP
What is a normal hs-CRP level?
For heart risk, the AHA and CDC class hs-CRP below 1 mg/L as lower risk, 1 to 3 mg/L as average risk and above 3 mg/L as higher risk. There is no lower limit to worry about, because a lower number is better. Reporting varies between labs, so read your result against the range printed on your own report.
How can I lower my hs-CRP naturally?
The best-supported levers are a Mediterranean-style diet, regular exercise, losing excess weight, quitting smoking, and keeping blood pressure and cholesterol under control. Sleep and gum health count too. Changes show up in your baseline as habits stick, so judge progress by repeat tests taken when you are well, not by a single reading.
Can exercise raise CRP levels?
Yes, briefly. Strenuous exercise, such as intense weight training or a long run, can cause a sudden jump in CRP and make a heart-risk test look worse than it is. Over months, regular exercise is one of the habits that helps bring hs-CRP down. Avoid very hard sessions in the days before your test.
What is the difference between CRP and hs-CRP?
Both tests measure the same protein. A standard CRP test covers high levels, roughly 10 to 1,000 mg/L, and is used to look for infection and inflammatory disease. The hs-CRP test detects levels down to about 0.1 mg/L, so it can pick up the low-grade inflammation tied to cardiovascular risk.
Sources
- MedlinePlus (NIH). C-reactive protein: MedlinePlus Medical Encyclopedia
- MedlinePlus (NIH). C-Reactive Protein (CRP) Test
- testing.com. C-Reactive Protein High Sensitivity (hs-CRP) Test
- testing.com. C-Reactive Protein (CRP) Test
- Cleveland Clinic. C-Reactive Protein (CRP) Test: What It Is, Purpose and Results
This page is general information, not medical advice, and it does not replace a consultation with your own doctor. Never start, stop or change a medicine or supplement because of something you read here.
All 17 markers on the Wolfburgh panel
Cholesterol & Heart Health
- Total Cholesterol
- HDL Cholesterol
- LDL Cholesterol
- Triglycerides
- VLDL CholesterolCalculated
- LDL to HDL RatioCalculated
- Triglyceride to HDL RatioCalculated
- Total Cholesterol to HDL RatioCalculated
Blood Sugar
Inflammation
Iron
Liver Function
Proteins
Vitamins & Hormones
Serious About Self? Your blood panel, your care team and the app, built into one system. Every application is reviewed personally.
Check Your Eligibility →