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C-reactive protein (CRP) by turbidimetry (serum/plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of C-reactive protein, a protein produced by the liver in response to inflammation in your body.

Quick summary

["CRP helps doctors assess inflammation, often used to monitor conditions like infections, autoimmune diseases, or after surgery."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
89368-5
Short code
ZIKV NS1 IgM Pnl SerPl IA
Synonyms
ZIKV NS1 IgM Pnl SerPl IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order CRP testing to check for signs of inflammation, monitor chronic conditions like rheumatoid arthritis or lupus, evaluate infections, or assess risks after procedures or injuries. It can also help track how well treatments are working.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or vein to draw blood. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Higher CRP levels often indicate inflammation, but they can also be normal in some situations (e.g., during pregnancy or after minor injuries). Your doctor will compare your results to your medical history and other tests to interpret them.

Common Conditions Monitored

CRP is commonly used to monitor conditions such as cardiovascular disease risk, infections (like pneumonia), inflammatory bowel disease, and certain cancers. It’s not a definitive test but can guide further investigation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP is a marker of systemic inflammation and is widely used in clinical practice to assess disease activity, guide treatment decisions, and evaluate response to therapy. While it doesn’t diagnose conditions alone, it helps doctors identify areas needing closer attention.

Short name

CRP (Serum/Plasma)

Frequently asked questions

What causes CRP levels to be higher than usual?
CRP levels can rise due to infections (like colds or flu), injuries, surgeries, or inflammatory diseases (like arthritis). Stress, smoking, or certain medications may also affect CRP levels, but they’re not the only causes.
How long does it take to get CRP test results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your doctor will contact you once they’re ready, or you may receive them electronically if you’ve requested it.
Can CRP levels be affected by diet or exercise?
Dietary factors like omega-3 fatty acids (found in fish) or anti-inflammatory foods may help lower CRP levels, but they don’t replace medical testing. Exercise can also reduce inflammation, but it’s not a substitute for lab results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy