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CRP (C-Reactive Protein)

CRP value: how high may your inflammation marker be?

CRP is a key inflammation marker for preventive health. Regular monitoring helps detect hidden inflammation before it leads to larger health concerns.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group

mg/l

Normal < 10 High

Female Your group

mg/l

Normal < 10 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

CRP (C-Reactive Protein): what this test measures

Your CRP value is the amount of C-reactive protein in your blood. Your liver makes this protein. It does so as soon as inflammation starts.

Once that starts, the amount of CRP rises sharply within 6 to 8 hours. Then it falls just as fast. How much CRP is in the blood tells you about scale. Not about where.

CRP is a protein your liver makes when there is inflammation somewhere in your body. Hence the nickname inflammation value.

It helps to know what the test does and does not do. It tells you that something is going on. It does not tell you where it sits or what it is. An infected tooth, a bladder infection and a large bruise can all three produce the same number.

Your result is in mg/L. Up to 10 mg/L counts as normal on the routine assay.

In full it is C-reactive protein, shortened to CRP. A CRP test measures that one protein and nothing else. With acute inflammation you see the rise within 6 to 8 hours. Bacterial infections give the highest values; viral ones often stay lower.

CRP (C-Reactive Protein): why this value matters

The most common question about this value is always the same. My CRP is 12 after a cold, should I worry?

Usually not, and that comes down to how fast this protein moves. Your CRP starts rising 6 to 8 hours after the trigger. It then roughly doubles every 8 hours.

It peaks after two days. After that it halves each day as long as the cause is gone.

So a value of 12 a few days after a cold is not strange. It is exactly what you would expect from a body still clearing up. It says nothing about anything chronic.

The only way to be sure is to re-test once you have genuinely recovered. Two weeks after your symptoms have gone is a good rule of thumb. If the value is normal then, you were right.

If it is still high, that is a question for your GP. And now it is a useful one.

CRP (C-Reactive Protein): when is testing worthwhile?

When you get tested decides what your result is worth. Test too early and you measure the aftermath of something already over.

The rule of thumb is simple: test when you feel well and rested. At least two weeks after a cold or flu has completely gone. And a few days after a hard training session.

These are the things that lift your value temporarily without anything being wrong.

What was going on	How long to wait
Cold or flu	2 weeks after recovery
Hard training session	3 to 4 days
Marathon or race	about a week
Vaccination	a few days
Surgery or a large bruise	discuss with your doctor
Infected tooth or gums	until it is treated

If you want to know whether an infection is clearing, testing twice with a day in between is more useful than one isolated result. Then you see the direction.

A CRP test looks for inflammation. Or rules it out. Acute inflammation usually gives a high number. Pneumonia is the common example.

An autoimmune disease keeps it mildly raised for longer. There are two CRP tests. The routine one is what you get here. To see whether something is settling, draw twice.

If your CRP is raised, it tells you that something is going on. The normal range your lab uses is printed on your result. Not every lab uses the same upper limit.

CRP (C-Reactive Protein): symptoms of a high or low value

Low Levels

A low value is good news and never needs treating. There is no lower limit you can fall below.

What you do sometimes see is a result reported as less than 5. That is not the same as a very precise low measurement. The routine test simply cannot see below about 5 mg/L. That is the floor of the test.

If you want information in that low range, for your cardiovascular risk for example? The <a href="/en/biomarkers/hs-crp">hs-CRP test</a> is built for it. Same protein, measured more sensitively.

And remember: a normal value does not rule out an infection. In the first hours your CRP has not risen yet.

High Levels

You do not feel a high inflammation value itself. What you feel comes from the cause. Fever, pain, a swollen spot, tiredness, or sometimes nothing at all.

With an unexpectedly high result, work through the ordinary list first. Were you ill in the past few weeks? Do you have a nagging tooth or bleeding gums?

Have you had a vaccination recently? Did you do a hard session or a race? Have you had a heavy fall?

One of those five explains a great many of the raised results that give people a fright.

If your value stays high while you feel fine and none of those apply, see your GP. Not because the number says what you have, because it does not. But because it raises the question of what to look at. Take your result with you.

CRP (C-Reactive Protein): what to do about an abnormal value

Male

If Low

Normal CRP indicates low inflammation. Maintain healthy lifestyle habits.

If High

Elevated CRP indicates inflammation or infection. Consider anti-inflammatory diet, exercise, and evaluation for underlying conditions.

Female

If Low

Normal CRP indicates low inflammation. Maintain healthy lifestyle habits.

If High

Elevated CRP indicates inflammation or infection. Consider anti-inflammatory diet, exercise, and evaluation for underlying conditions.

CRP (C-Reactive Protein): lifestyle and this value

You cannot bring a CRP number down directly, and you do not need to. It is a gauge showing what sits underneath. Remove the cause and the gauge falls by itself.

Three things demonstrably work. Stopping smoking. Losing abdominal fat, because fat tissue continuously makes the substance that prompts your liver to produce CRP. And regular moderate exercise, which lowers your value in the long run.

Watch that last one, because it looks contradictory. One hard session lifts your CRP temporarily. Exercising regularly lowers it over months. Those two get confused a lot.

Sleep counts for more than most people think. Short or restless sleep measurably lifts the value.

On food: patterns rich in vegetables, fruit, legumes, nuts and oily fish are associated with lower values. Do not start supplements on the basis of a blood result; discuss that with your GP.

CRP (C-Reactive Protein): frequently asked questions

My CRP is 12 after a cold. Is that bad?

Usually not. Your value peaks two days after the trigger and then halves each day. A 12 shortly after a cold fits a body still clearing up. Re-test once you have been symptom-free for two weeks.

How long should I wait to test after being ill?

Two weeks after your symptoms have completely gone. Test earlier and you measure the aftermath rather than your usual level.

Does a high value mean I have something serious?

No. The number only says an inflammatory response is running somewhere. An infected tooth, a vaccination or a hard session explain a great many raised results.

What does a result of less than 5 mean?

That is the floor of the routine test, not a very precise measurement. The test simply cannot see below it.

Can I do anything myself to lower my value?

Not directly. What helps is removing the cause: stopping smoking, losing abdominal fat, exercising regularly and sleeping enough. The number follows on its own.

How high is the CRP value in cancer?

There is no fixed number here, and that matters. CRP is a general inflammation marker: it tells you something is going on, never what. A raised value comes from an infection far more often than anything serious. Always take an abnormal result to your doctor.

Test Products

This marker is included in the following test panels.

InsideTracker

An InsideTracker blood test with 35 biomarkers: heart, hormones, metabolism, inflammation, recovery and iron status. Measured in the Netherlands.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count

€399,-

Whoop

A 43-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Basic Blood Count

€499,-

Whoop

Whoop Heart Health

A 45-biomarker heart health panel inspired by the WHOOP Heart Health Panel — an advanced look at cholesterol, lipoproteins, inflammation and kidney function.

Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) Cystatin C Uric Acid

€629,-

Whoop

Whoop Performance Health

A 50-biomarker performance panel inspired by the WHOOP Performance Health Panel — recovery, blood production, thyroid, hormones, iron and nutrient status for people who train.

€689,-

Whoop

Whoop Metabolic Health

A 51-biomarker metabolic panel inspired by the WHOOP Metabolic Health Panel — blood sugar regulation, insulin, thyroid, liver and the mineral cofactors behind your metabolism.

€799,-

Whoop

Whoop Women's Health

A 53-biomarker women's health panel inspired by the WHOOP Women's Health Panel — fertility, cycle and thyroid hormones plus a complete metabolic and nutrient base.

€709,-

Whoop

Whoop Men's Health

A 48-biomarker men's health panel inspired by the WHOOP Men's Health Panel — testosterone, PSA and prostate health plus a complete metabolic and hormone base.

€659,-

InsideTracker

InsideTracker Gut Health

A 6-biomarker gut health panel inspired by InsideTracker's Gut Health category — the blood values behind your gut score: blood sugar regulation, inflammation, stress and blood lipids.

Glucose (Fasting) HbA1c (Glycated Hemoglobin) CRP (C-Reactive Protein) Cortisol HDL Cholesterol Triglycerides

€129,-

InsideTracker

InsideTracker Heart Health

A 7-biomarker heart health panel inspired by InsideTracker's Heart Health category — ApoB, the full cholesterol profile, triglycerides, hs-CRP and TSH behind your heart score.

ApoB (Apolipoprotein B) TSH (Thyroid Stimulating Hormone) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides CRP (C-Reactive Protein)

€129,-

InsideTracker

InsideTracker Recovery

A 10-biomarker recovery panel inspired by InsideTracker's Recovery category — muscle enzymes, liver values, electrolytes, magnesium and vitamin D behind your recovery score.

Magnesium CRP (C-Reactive Protein) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) GGT (Gamma-Glutamyl Transferase) Albumin Creatine Kinase (CK) Sodium Potassium Vitamin D (25-OH)

€139,-

InsideTracker

InsideTracker Inflammation

A 5-biomarker inflammation panel inspired by InsideTracker's Inflammation category — hs-CRP, a complete blood count with differential, vitamin D and ferritin behind your inflammation score.

CRP (C-Reactive Protein) Complete Blood Count (CBC) Leukocyte Differential Vitamin D (25-OH) Ferritin

€139,-

InsideTracker

InsideTracker Sleep

A 10-biomarker sleep panel inspired by InsideTracker's Sleep category — blood sugar regulation, magnesium, vitamin D, inflammation, testosterone and cortisol behind your sleep score.

Insulin (Fasting) Magnesium Glucose (Fasting) HbA1c (Glycated Hemoglobin) Vitamin D (25-OH) CRP (C-Reactive Protein) Complete Blood Count (CBC) Total Testosterone Cortisol HOMA-IR

€199,-

Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy

CIBG Ministerie van Volksgezondheid,
Welzijn en Sport Official BIG registration BIG 49928676701

Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

CRP (C-Reactive Protein)

€18,-

Reference Ranges

CRP (C-Reactive Protein): what this test measures

CRP (C-Reactive Protein): why this value matters

CRP (C-Reactive Protein): when is testing worthwhile?

CRP (C-Reactive Protein): symptoms of a high or low value

Low Levels

High Levels

CRP (C-Reactive Protein): what to do about an abnormal value

Male

Female

CRP (C-Reactive Protein): lifestyle and this value

CRP (C-Reactive Protein): frequently asked questions

Test Products

InsideTracker

Whoop

Whoop Heart Health

Whoop Performance Health

Whoop Metabolic Health

Whoop Women's Health

Whoop Men's Health

InsideTracker Gut Health

InsideTracker Heart Health

InsideTracker Recovery

InsideTracker Inflammation

InsideTracker Sleep

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Medical standards