Inflammation Marker

CRP Test (C-Reactive Protein)

CRP is a protein your liver releases in response to inflammation or infection. A high CRP tells your doctor something is inflaming your body, even if you feel fine.¹

Written by Suman Konda, Clinical Pharmacist · Based on peer-reviewed sources · Editorial policy · Not medical advice

Last reviewed and updated: 26 September 2026 · How we check our content

What is a CRP test?

C-Reactive Protein (CRP) is an acute-phase protein produced by the liver within a few hours of infection, injury or inflammation. It rises rapidly (within 6–12 hours) and falls just as fast when the cause resolves, making it an excellent real-time marker of active inflammation. There are two types of CRP test: standard CRP (for detecting significant inflammation) and high-sensitivity CRP (hsCRP, for assessing heart disease risk at lower levels).

CRP Normal Range

Test Type	Value	Interpretation
Standard CRP: Normal	<10 mg/L	No significant inflammation
Standard CRP: Mild elevation	10 – 50 mg/L	Mild inflammation / viral infection
Standard CRP: Significant	50 – 200 mg/L	Active bacterial infection likely
Standard CRP: Severe	> 200 mg/L	Severe infection / serious condition
hsCRP: Low CV risk	< 1 mg/L	Low cardiovascular risk
hsCRP: Moderate CV risk	1 – 3 mg/L	Moderate CV risk
hsCRP: High CV risk	> 3 mg/L	High cardiovascular risk

Key points

Normal CRP is below 10 mg/L, meaning no significant inflammation.
Levels of 10-50 mg/L suggest mild inflammation or viral infection; 50-200 mg/L point toward active bacterial infection; above 200 mg/L signals severe infection.
CRP rises within 6-12 hours of inflammation and falls quickly when the cause resolves, making it a real-time marker of active disease.
Standard CRP detects significant inflammation; hsCRP measures tiny amounts and is used to assess long-term cardiovascular risk (below 1 mg/L is low risk).
CRP does not tell you where the inflammation is; the source is found by combining it with symptoms and other tests.
ESR rises more slowly and stays elevated longer, so doctors often order both: CRP for acute activity, ESR for monitoring chronic disease.

High CRP: what it can mean (and what it can’t tell you)

A high CRP means your body is fighting inflammation somewhere — but the test cannot tell you where. CRP is a sensitive but non-specific marker: it signals that inflammation is present and roughly how severe it is, not which organ is involved or why. That distinction is the single most misunderstood thing about this test.

Common causes of a raised CRP include bacterial infections (pneumonia, urinary tract infections, appendicitis), viral infections (dengue, COVID-19), autoimmune conditions (rheumatoid arthritis, lupus, inflammatory bowel disease), recovery after surgery or injury, heart attack (CRP rises within hours), and some cancers.² As a rough guide, a mild elevation (10–50 mg/L) accompanies many everyday conditions and is the least specific; a markedly raised CRP (above 50 mg/L) most often reflects a bacterial infection or an inflammatory flare; very high values (above 200 mg/L) usually mean a severe infection or serious inflammatory condition.

Because CRP rises within hours and falls quickly once the trigger settles, doctors value the trend across repeat tests more than any single number — a falling CRP after treatment starts is one of the most reassuring signals that the treatment is working. A high-sensitivity version of the test (hsCRP) is used differently: it measures tiny amounts of CRP to help assess long-term cardiovascular risk, not to look for infection. Ordering the wrong one is a common mix-up, so check which one your prescription actually says.

CRP vs hsCRP vs ESR vs procalcitonin: how they compare

CRP is one of several inflammation markers, and they are not interchangeable. Each answers a different question:

Marker	What it measures	Speed of change	Best used for	Key limitation
CRP (standard)	C-reactive protein in mg/L	Rises in 6–12 hours, falls within days	Detecting and tracking active infection or inflammation; monitoring treatment response	Non-specific — cannot locate the inflammation
hsCRP	Same protein, measured at very low levels	Stable over time; not for acute tracking	Long-term cardiovascular risk assessment	Useless for detecting acute infection
ESR	How fast red cells settle, in mm/hr	Rises over days, falls slowly	Monitoring chronic inflammation (e.g. in rheumatology)	Affected by age, anaemia and pregnancy; slow to change³
Procalcitonin	Procalcitonin in ng/mL	Rises in 3–6 hours	Helping distinguish bacterial from viral infection; guiding antibiotic decisions alongside clinical judgment	Costlier; meaningful only in clinical context

Doctors sometimes order CRP and ESR together, since occasionally one is raised when the other is not. None of these tests diagnoses a specific disease on its own.

Reading your report: what your doctor actually looks at

When a doctor opens a CRP report, the number itself is only the starting point. Here is the checklist they run through — and the same checklist helps you read your own report calmly:

Which test was ordered? Standard CRP and hsCRP are different tests for different jobs (infection versus long-term heart risk). Make sure you are reading the right reference range.
Which band is the value in? Below 10 mg/L is reassuring; 10–50 suggests mild inflammation; 50–200 points toward an active bacterial process; above 200 signals something severe. The band matters more than whether the value is merely “high”.
What is the trend? A single mildly raised reading means little on its own. A value that is falling on repeat testing is reassuring; one that keeps climbing deserves attention.
What else was happening? A recent cold, flu, dental infection, hard workout, vaccination or surgery can all push CRP up for a week or two. Mention these when the blood is drawn so the result is read in context.
What do the other findings say? CRP is always interpreted alongside symptoms and other tests — never in isolation. A high CRP with no clinical story is a reason to investigate, not a diagnosis.

If your report shows a mild elevation and you feel well, the usual next step is simply to recheck after a couple of weeks rather than to worry. Discuss the full picture with your doctor before drawing conclusions.

CRP test price in India: typical bands across major lab chains

CRP is an inexpensive, widely available test. Typical list-price bands seen across major Indian lab chains are:

Lab chain	Typical CRP price band	Notes
Dr Lal PathLabs	Typically &rupee;550–&rupee;700	Wide network; online booking often slightly cheaper
Metropolis Healthcare	Typically &rupee;450–&rupee;600	Frequent online discounts
Thyrocare (via partner labs)	Typically &rupee;300–&rupee;450	Often the lowest list price; home collection available
Apollo 24\|7	Typically &rupee;400–&rupee;550	Integrated with Apollo hospitals
Orange Health	Typically &rupee;500–&rupee;650	Home-collection focused in metro cities

These are approximate bands, not quotes: prices change often and vary by city, and home collection can add a small fee. hsCRP is usually priced a little higher than standard CRP. Where possible, choose a NABL-accredited lab, and remember the range printed on your own report is the one that counts.

Questions to ask your doctor

Is this standard CRP or hsCRP: and what specifically were you checking for?
What is causing the elevated CRP?
Do I need antibiotics or anti-inflammatory treatment?
When should I recheck to confirm it has come down?

Frequently Asked Questions

Do I need to fast for a CRP test?

No. CRP does not require fasting and can be taken at any time.

What does a high CRP mean?

It indicates inflammation, often from infection, but also from injury, surgery or inflammatory conditions. It shows something is active but not exactly what, so it is read alongside other findings.

How quickly does CRP change?

CRP rises within hours of inflammation starting and falls quickly once it settles, which makes it useful for monitoring response to treatment.

What is the difference between CRP and ESR?

Both measure inflammation, but CRP responds faster and is better for tracking rapid change, while ESR is slower and influenced by age and anaemia.

My CRP is 12 mg/L but I feel fine. Should I worry?

A mildly raised CRP with no symptoms is common and often temporary — a recent cold, hard exercise, or even gum inflammation can cause it. What matters is the trend: doctors usually repeat the test after a couple of weeks rather than acting on one value. Discuss it with your doctor instead of chasing a single number.

Can I lower my CRP naturally?

CRP follows inflammation, so the habits that cool inflammation help: treating infections, looking after dental health, not smoking, keeping a healthy weight, and sleeping well. No supplement is proven to lower CRP on its own, so be cautious of products that claim to. Ask your doctor or pharmacist before starting anything new.

My doctor ordered hsCRP but the lab did a regular CRP. Does it matter?

Yes, they answer different questions: regular CRP detects active inflammation, while hsCRP measures tiny amounts used in cardiovascular risk assessment. If the wrong one was done, the result may not answer your doctor’s question — check with the lab or your doctor.

Does taking a statin affect my CRP result?

Statins can lower CRP through their anti-inflammatory effect, so your result may read lower while you are on one. Keep taking your prescribed medicine and make sure your doctor knows about it when reading the result.

How much does the CRP test cost in India?

The CRP test typically costs ₹300–₹600 in India, though prices vary by city and lab. Choose a NABL-accredited lab where possible — and remember the reference range printed on your own report is the one that counts. Discuss the result with your doctor.

What is the full form of CRP?

CRP stands for C-reactive protein.

Pharmacist's practical notes

CRP moves fast: it rises within hours of inflammation starting and falls within days once the trigger settles. That is why doctors pay more attention to the trend across repeat tests than to any single value. One mildly raised reading on its own rarely means much.

If you are having CRP monitored for a long-term condition such as rheumatoid arthritis, try not to test during an unrelated cold, flu, or dental infection. A fresh infection can push CRP up for a week or two and muddy the trend your doctor is following. Mention any recent illness when the blood is drawn so the result is read in context.

CRP and hsCRP measure the same protein but answer different questions. Standard CRP detects active inflammation or infection; hsCRP (high-sensitivity CRP) measures much smaller amounts to help assess cardiovascular risk. Ordering the wrong one is a common mix-up, so check which one your prescription actually says.

Statins, taken for cholesterol, can lower CRP as part of their anti-inflammatory effect. If you take one, your CRP may read lower than it otherwise would. Keep taking your prescribed medicine and make sure your doctor knows about it when interpreting the result. If a result surprises you, discuss it with your doctor before repeating the test.

In India

Indian labs report CRP in mg/L, the same unit used internationally, so the ranges on this page apply directly. Typical prices are compared chain-by-chain in the table above.

Where possible, choose a NABL-accredited lab. Reference ranges can differ slightly depending on the analyser a lab uses, so the range printed on your own report is the one that counts — not a number from a website.

References

Sources cited on this page. PubMed links open the original abstract.

Pepys MB, Hirschfield GM. C-reactive protein: a critical update. J Clin Invest. 2003;111(12):1805–1812. PMID 12813013 · doi:10.1172/JCI18921
Póvoa P, Coelho L, Bos LD, et al. How to use biomarkers of infection or sepsis at the bedside: guide to clinicians. Intensive Care Med. 2023;49(2):142–153. PMID 36592205 · doi:10.1007/s00134-022-06956-y
Bray C, Bell LN, Liang H, et al. Erythrocyte Sedimentation Rate and C-reactive Protein Measurements and Their Relevance in Clinical Medicine. WMJ. 2016;115(6):317–321. PMID 29094869

Medical Disclaimer: This page is for general educational purposes only and does not constitute medical advice. Always consult a qualified doctor before making any health decisions.