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C-reactive protein (CRP) mass concentration in plasma

Published: August 9, 2026Updated: August 17, 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 17, 2026Editorial policy

Key facts at a glance

LOINC
2895-1
Short code
ZPP RBC-mCnc
Synonyms
ZPP RBC-mCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
4.2
Ref high
5.9
Critical range
2 N/A – 7 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85041
SNOMED
900000000000003001
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test to check for signs of inflammation. It can help diagnose conditions like infections, heart disease, or certain autoimmune disorders. It may also be used to monitor treatment progress or check for recurrence of conditions like rheumatoid arthritis or lupus.

What to Expect Before the Test

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

How the Results Are Interpreted

Results are typically reported in milligrams per liter (mg/L). Higher than normal levels may indicate inflammation, but results alone don’t diagnose a specific condition. Your doctor will consider your symptoms and other test results.

Common Conditions Monitored

Elevated CRP levels can signal infections (like pneumonia or urinary tract infections), inflammatory diseases (like lupus or inflammatory bowel disease), or other health issues. It’s not a standalone test but often used alongside others.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A

Specimen: whole-blood

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Plasma)

Frequently asked questions

How long does it take to get CRP test results?
Results are usually available within 1–3 business days, depending on your lab. Some labs may provide results sooner if needed for urgent care.
Can CRP levels change with diet or exercise?
Diet and exercise can influence inflammation indirectly. For example, a healthy diet may reduce inflammation over time, but CRP levels are primarily tied to active inflammation in your body.
Is CRP the same as a white blood cell count (WBC) test?
No, CRP measures a protein produced by the liver in response to inflammation, while a WBC test counts your immune cells. Both can be used together to assess health but measure different things.
  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 17, 2026. · Read our editorial policy