C-Reactive Protein or CRP Normal Levels Chart For Adults

Medically Reviewed By: DR. Rashmi GR, M.B.B.S, Diabetologist March 14, 2022

Last updated on April 19th, 2022

C-reactive protein is a marker of inflammatory signs in the body. If test results display such numbers, it indicates an ongoing problem in the body. A CRP test assesses blood levels of a substance. This is known as C-reactive protein (CRP). The liver forms CRP responding to inflammation in the body. The body’s healing response is inflammation. When a wound or injury goes red, inflames, or hurts, it represents inflammation. Also, it’s the body’s natural response to illnesses, infections, or trauma.

Inflammatory Processes

The inflammatory process activates a person’s immune system to direct healing WBCs to the infected region. These first respondent cells form chemicals known as cytokines. Cytokines increase the length of the blood vessels. This allows more supply of blood, oxygen, and cells to the region. The enhanced blood flow results in inflammation, heat, and redness.

Inflammation can be of two types: acute and chronic. In acute inflammation, a person’s body reacts to infection or damage. Also, the process persists from hours to numerous days. Yet, in chronic inflammation, the response continues. Also, a person’s body remains in a phase of high vigilance. This low-grade inflammatory process might start harming healthy tissues. And, it results in issues all over the body. Consequently, chronic inflammation is damaging. And, it might add to chronic medical problems like cancer or heart diseases.

When inflammation takes place, the concentration of serum proteins known as acute phase reactants follows inflammation. C reactive protein is one of the acute phase reactants. CRP tests aid doctors detect inflammation. And, the test monitors the efficiency of the current treatment. Inflammation is an intricate, highly arranged method that includes several cell types. These diverse cells might start, augment, maintain, or remove inflammation. Also, they are an indication of heart disorders. Read this article to know what CRP tests are. And, how it helps describe the significance of various CRP levels.

c reactive protein levels

Normal Levels of CRP

The units of CRP measurement are in milligrams of CRP per litre of blood (i.e., mg/L). In healthy people, standard CRP levels must be below 3 mg/L. Even though, reference limits might differ. As an actual fact, the CRP level that is actually normal is unknown. CRP levels more than 3.0 mg/L show start of inflammation in adults. Also, the CRP value usually enhances:

  • with age
  • in African American people
  • in females.

The table below shows what the different CRP levels could indicate. But bear in mind that these ranges may vary slightly between laboratories.

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CRP Levels Chart

Chart of Normal CRP Levels in Adults
CRP Level Elevation Significance
Below 3 mg/L Normal In healthy adults
3-10 mg/L Normal or minor rise Because of diabetes, smoking, pregnancy, depression, obesity, inactive lifestyle, or cardiovascular risk
10-100 mg/dL Moderate rise Autoimmune conditions, heart attack, cancers, bronchitis
>100 mg/dL Marked rise Short-term bacterial or viral infection, or trauma
>500 mg/dL Severe rise Short-term bacterial infections


C-reactive protein test demands a blood test. The test is generally performed from a vein in the arm. It must not hurt besides a small sting when the needle goes in and leaves the vein. There’s generally no need for preparation like fasting or dodging liquids prior to the test.

How much CRP level is dangerous?

The higher the magnitude of the CRP level higher the prevalence of inflammation. Inflammation in the body is not good for especially for diabetes and heart patioents. CRP level below 3 mg/dL is considered safe and normal. However, a person’s normal CRP level depend son several other factors like age, gender, prevelant disorders, etc. Generally, according to the Rela Hospital website, CRP level between 10 mg/dL to 100 mg/dL depicts moderately dangerous levels of inflammation. Plus, CRP levels anything above 100 mg/dL is severely dangerous. Moreover, this level is of CRP should be avoided especially by diabetes patients and those suffering from heart ailments.

Factors Affecting the CRP levels

Various factors have an effect on C-reactive protein levels, such as:

  • Exercise: Strenuous exercise might raise the levels of CRP. As a result, the person must avoid a hard workout prior to giving blood.
  • Hormone levels: People utilizing estrogen-based birth control or hormone replacements might experience higher CRP levels. Similarly, pregnancy might increase C-reactive protein levels, chiefly during the later phases.
  • Recent infection or injuries: Minor conditions might increase CRP temporarily. According to University of Rochester Medical Center  chronic health problems like diabetes or heart disorders increase CRP levels.
  • Medicines:  According to Rochester University Medical Center, few cholesterol-reducing medicines (statins), and NSAIDs, might lower your inflammation and reduce CRP levels.
  • Magnesium supplementation: This might reduce CRP levels in a few individuals. Ask the doctor whether to stop the use of supplements before drawing blood.
  • Other factors: People might have higher baseline CRP levels. These may include females, elders, smokers, diabetics, people with obesity, or depression.

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When a Healthcare Provider Orders a CRP Test

Doctor might order a CRP test if a person has signs of a severe bacterial or viral infection like:

  • nausea and vomiting
  • fast breathing
  • fever or chills
  • abnormal heart rate

The doctor might also order a CRP test to monitor the ongoing treatment if a person has a diagnosis of chronic autoimmune conditions like lupus. It monitors the level of the latest inflammation. If treatment is functional, inflammation and CRP levels fall down.

As doctors cannot always draw solid outcomes from CRP levels alone, they might also request other tests. They offer a higher thorough overview of a person’s health. CRP may also work as a predictor of CHF. If a person is at risk of heart disorder, the doctor might also request a high-sensitivity CRP test. The high sensitivity CRP test is a special test that identifies lower levels of CRP in the blood as compared to the routine test results. The high sensitivity CRP level ranges from 0.5 to 10 mg/L. Levels more than 3 mg/L are high risk for developing heart problems.


Classically, CRP tests are rapid and precise. Yet, if a person has only slightly raised CRP levels, the test may be hard to interpret. This can be due to several potential conditions responsible for this effect. High CRP is a biomarker. That means that it’s one factor to contemplate while evaluating a person’s health. Also, it does not deliver a source of inflammation. A high CRP level is not a separate diagnosis.

What is Taken as a High CRP Level?

According to the Mayo Clinic, CPR Levels more than 8 mg/dL, is taken as a high CRP level. Usually, “a CRP reading above 10 mg/L is risky. It potentially results due to a serious bacterial infection. Also, it shows short-term inflammation demanding additional tests to detect the cause of the inflammation.

C-Reactive Protein or CRP Normal Levels Chart For Adults (Male or Female), Child (New Borns)

Signs of high CRP

The signs of high CRP levels are based upon underlying problems responsible for inflammation. It’s likely to experience high C-Reactive protein levels with no signs. If a person experiences a moderate infection or injury that results in inflammation-  According to Rochester University’s Health Center signs can be:

  • unexplained weight loss
  • low-grade fever
  • bloating
  • headaches
  • general weakness
  • pain all over the body
  • fatigue
  • chills
  • GI troubles like nausea, loss of hunger, or indigestion
  • difficulty sleeping or insomnia

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Reasons for High C-reactive Protein Levels

High CRP levels may take place due to:

  • Obesity
  • Smoking
  • Severe bacterial or fungal infections
  • Pneumonia
  • UTIs
  • Bronchitis
  • Viral problems such as COVID-19
  • Pregnancy
  • Depression
  • Diabetes
  • Sepsis
  • Osteomyelitis
  • Heart attack
  • Cancer
  • Inactive lifestyle
  • Lupus, rheumatoid arthritis

CRP Levels and COVID-19

C-Reactive protein levels seem to enhance in individuals affected with SARS-CoV-2. It is a virus responsible for COVID-19. Serious COVID-19 infections may result in an overproduction of inflammatory cytokines and interleukins. According to a 2021 report by International  Journal of Epidemiology  says, CRP messengers assist the body in fighting the virus. Also, they may harm lung tissue when the immune system over-responds. In combination, the inflammatory cytokines and tissue damage may enhance the production of CRP.

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Reducing CRP Levels

There’s an array of dietary approaches and lifestyle changes to reduce C-reactive protein levels. Moreover, a doctor might suggest medicine if suitable.

Treat the underlying health problem

The most significant step a person must take is to discuss with a doctor to identify why it is raised. Treating the condition responsible for inflammation is vital for lowering a raised CRP level.

Weight loss

Weight loss helps to lessen CRP levels.


Increasing the heart rate and regular physical activity lowers down CRP levels due to an inactive lifestyle. And, the amount of exercise required to reduce CRP levels isn’t much. The total energy expenditure of approximately 1,000 calories per week may help.


Mental outlook has an effect on the body and C-reactive protein levels. Mindfulness practices, meditation, and yoga helps to change a person’s mental outlook.


To aid the reduction of systemic inflammation and CRP levels, a person must have a multi-coloured diet. The diet must be rich in fibre, fruits and veggies. A Mediterranean-style diet is a superb choice. Good foods to add-in can be:

  1. bananas
  2. pears
  3. beans and legumes
  4. apples
  5. avocados
  6. whole grains
  7. cruciferous veggies such as brussels sprouts and broccoli
  8. strawberries

Intake of a small amount of alcohol, like a glass of wine, helps to reduce C-Reactive protein levels more so than avoiding alcohol altogether. The kind of alcohol seems irrelevant, as long it’s within limits (not above 7 alcoholic drinks a week for females or 14 for men). Other valuable drinks to consider can be coffee and green tea. It appears that a greater intake of coffee and lower CRP accompanies each other. The compounds present in green tea lower the markers of inflammation, like CRP.


“Supplements may also lower C-reactive protein levels,” says a  2021 study by National Library of Medicine. Omega-3 fatty acids can reduce inflammation according to the American Heart Association. Additionally, some research shows that vitamin D can reduce inflammation, and C-Reactive protein levels.


Doctors make use of CRP tests to identify the levels of CRP in the body. A rise in the levels of protein might show an underlying health problem. The treatment for raised levels varies as per the cause. A range of health problems may result in mildly or moderately increased levels. Also, very high C-Reactive protein levels are usually simpler to detect.


What ailments result in high CRP?

A range of inflammatory conditions may result in raised CRP levels. These conditions can be autoimmune problems. They are rheumatoid arthritis, lupus, inflammatory bowel disease, Crohn’s disease and ulcerative colitis.

Does level of CRP rise in viral infection?

The level of CRP in blood elevates within some hours of a severe infection. CRP levels may also elevate in presence of a viral infection. However, the levels do not go as high as during a bacterial infection.

How rapidly does CRP reduce?

After the bacterial activation for inflammation is removed, CRP levels reduce rapidly. The half-life is roughly 19 hours.

What level of CRP shows COVID?

Normally, CRP level in blood is below 5 mg/L. People with COVID-19 show a significantly elevated CRP level.

Last Updated on by Dr. Damanjit Duggal 


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