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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
57806-2
Short code
HEDIS 2010-13 PPC-C RUBV
Synonyms
HEDIS 2010-13 PPC-C RUBV
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 healthcare provider may order this test to check for signs of inflammation, evaluate the effectiveness of treatments for conditions like arthritis or heart disease, or monitor recovery from illness or surgery. It can also help diagnose infections or identify risks for conditions like heart disease.

What to Expect Before the Test

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

What Happens During the Test?

Blood is collected from a vein in your arm and sent to a lab. The lab uses a method called turbidimetry to measure the CRP protein levels in your serum or plasma.

What Are the Results?

Results are typically reported in milligrams per liter (mg/L). Higher levels may indicate inflammation, while lower levels suggest little to no inflammation. Your provider will interpret the results in the context of your health and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP Level

Frequently asked questions

How long does it take to get my CRP test results?
Results are usually available within 1 to 3 business days, depending on your lab’s processing time. Your provider will contact you once they have the results.
Can I eat or drink before my CRP test?
You can eat and drink normally before your test, as no special diet or fasting is required.
Is there anything I should avoid before the test?
Avoid taking nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or aspirin for 24 hours before the test, as they may lower CRP levels. Let your provider know if you’re on any medications.
  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