C-Reactive Protein (CRP): What Your Inflammation Marker Means

Quick answer

Your liver makes CRP in response to inflammation. Standard CRP finds real inflammation, usually above 10 mg/L. High-sensitivity CRP, or hs-CRP, finds much smaller rises tied to long-term disease risk. The healthy target for hs-CRP is under 1 mg/L. A level that stays above 3 mg/L predicts heart problems.

CRP vs. hs-CRP: same protein, different test

The protein itself is the same. Only the test sensitivity differs.

Standard CRP

• Finds real inflammation, usually above 10 mg/L.
• Used for infections, severe inflammation, and checking recovery after surgery.
• An older, common, low-cost test.

High-sensitivity CRP (hs-CRP)

• Finds small rises, down to under 1 mg/L.
• Used for heart risk checks, and tracking chronic inflammation.
• A newer test, also widely available.

For heart risk and chronic inflammation, hs-CRP is the test that matters. Some labs report both. Others report only the one that was ordered.

What the numbers mean

Standard CRP

• Under 10 mg/L: not raised.
• 10 to 40 mg/L: mild to moderate inflammation.
• 40 to 200 mg/L: real inflammation, often an infection.
• Above 200 mg/L: severe inflammation, such as sepsis or a major injury.

hs-CRP

• Under 1 mg/L: low heart risk.
• 1 to 3 mg/L: moderate.
• Above 3 mg/L: high heart risk.
• Above 10 mg/L: usually a sign of acute illness. Retest once you recover.

Say your CRP comes back above 10. This usually means either a current illness, or a short-term spike. For a true chronic risk check, retest 4 to 6 weeks after you recover.

What causes a high CRP

Short-term causes (CRP above 10 mg/L)

• A bacterial or viral infection.
• A recent injury or surgery.
• A flare-up, such as gout, or severe pancreas inflammation.
• Hard exercise, for a short time.
• A vaccine, for a short time.

Long-term causes (hs-CRP staying above 1 to 3 mg/L)

• Extra belly fat.
• Untreated obesity.
• Poor sleep, or sleep apnea.
• Ongoing stress.
• Gum disease.
• Smoking.
• A sedentary lifestyle.
• A diet high in refined carbs, sugar, and processed food.
• An ongoing infection, such as gum disease or untreated hepatitis.
• Autoimmune disease, such as rheumatoid arthritis or lupus.
• Heart disease itself.

Allergies are not on this list. Allergic reactions run on a different antibody, called IgE. Our guide covers what IgE allergy blood testing reveals.

How to read your CRP result

Follow these steps.

Step 1: Check which test you had

Confirm whether your result is standard CRP or hs-CRP. Each uses a different range.

Step 2: Rule out a short-term cause

A recent illness, injury, vaccine, or hard workout can raise CRP for a short time.

Step 3: Apply the right range

For heart risk: hs-CRP under 1 is best, 1 to 3 is moderate, above 3 is high. For a short-term check: under 10 on standard CRP suggests no major active inflammation.

Step 4: Look at the bigger picture

A high hs-CRP alongside high ApoB, triglycerides, or insulin tells a different story than a high hs-CRP by itself.

Step 5: Retest, if a short-term cause applies

Wait 4 to 6 weeks after a recent illness or injury, then retest.

Step 6: Work on the changeable causes

For a lasting high result, focus on belly fat, sleep, diet, dental health, smoking, and exercise.

Common patterns

Pattern 1: Heart-related chronic inflammation

• hs-CRP 2 to 6 mg/L, staying high.
• Often paired with a high ApoB and other metabolic markers.
• What to do: work on belly fat, diet, and sleep. Talk with your doctor about your overall heart risk.

Pattern 2: An active infection or injury

• CRP 50 to 200 mg/L.
• Recent symptoms, or a known infection.
• What to do: treat the underlying cause. CRP falls as it clears up.

Pattern 3: Possible autoimmune activity

• Both hs-CRP and ESR are high.
• Often joint pain, fatigue, or a rash.
• What to do: see a doctor for a closer workup.

Pattern 4: Recovery from illness or a vaccine

• hs-CRP is temporarily high.
• A recent event within the last 2 to 4 weeks.
• What to do: retest in 4 to 6 weeks.

Pattern 5: A healthy result

• hs-CRP under 1 mg/L, staying low.
• What to do: keep up your current habits.

How to lower your CRP

The steps in our chronic inflammation guide, linked below, apply here too:

• Work on belly fat.
• Improve your sleep.
• Try a Mediterranean-style diet.
• Move your body regularly.
• Take an omega-3 supplement.
• Treat gum disease.
• Cut smoking and alcohol.
• Manage stress.
• Fix a low vitamin D.

Most lifestyle changes bring a real drop in hs-CRP within 4 to 12 weeks. A full panel is a simple way to check your starting point.

Medicine that also lowers inflammation

Statins lower hs-CRP, beyond their effect on cholesterol. One major trial showed a heart benefit from statins in people with high hs-CRP, even with normal cholesterol. This is a choice to make with your doctor, alongside your other risk factors.

Why standard checkup panels often skip CRP

Cost is the main reason. Insurance-paid panels tend to stick to the cheapest set of tests. CRP, especially the high-sensitivity version, is known to be useful, but it often gets left off. Adding it is one of the best upgrades to a basic panel.

How &you Labs reports CRP

Every &you Labs panel checks hs-CRP by default. Your report shows your value, your heart risk band, and how it reads alongside your cholesterol and metabolic markers. It also gives clear next steps for a high result. See the full list of markers we test on our biomarker page.

Frequently asked questions

Is standard CRP the same test as hs-CRP?

Same protein, different sensitivity. Standard CRP finds real inflammation. Hs-CRP finds the small, chronic kind tied to heart risk.

Can exercise raise my CRP?

Yes. Hard exercise can raise CRP for a few days. Skip vigorous exercise for 48 hours before your test, for the most accurate reading.

What about a dental visit or a vaccine?

Both can raise CRP for a short time. Wait 2 to 4 weeks after either one, before testing for chronic inflammation.

Can a viral illness raise CRP for months?

A normal illness clears up within 2 to 4 weeks. A result that stays high past that point needs a closer look.

Should I worry if my hs-CRP is 1.5?

That falls in the moderate range. It is not an emergency, but it is worth addressing. Belly fat, sleep, diet, and exercise changes over 12 weeks usually bring it down.

Key takeaways

• CRP measures inflammation. Hs-CRP is the more sensitive test for the chronic, low-grade kind.
• The healthy target for hs-CRP is under 1 mg/L. A level that stays above 3 predicts heart problems.
• Standard checkup panels often skip hs-CRP. Adding it is one of the best upgrades you can make.
• A recent illness, injury, vaccine, or hard workout can raise CRP for a short time. Retest after 4 to 6 weeks.
• Most chronic CRP improves with less belly fat, a better diet, more exercise, better sleep, and healthy gums.