Skip to content

C-reactive protein (CRP) quantitative probe measurement

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
45089-0
Short code
C trach rRNA Anal Ql Probe
Synonyms
C trach rRNA Anal Ql Probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe
CPT
86038
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 This Test Matters

CRP is a marker that rises when your body is fighting inflammation. It’s often checked alongside other tests to guide treatment decisions, especially in conditions like arthritis, heart disease, or infections.

What to Expect During the Test

A small blood sample is taken from your arm. The test involves collecting serum or plasma, which is then analyzed for CRP levels using a specialized probe method.

Common Uses and Conditions

Doctors may order this test to monitor chronic inflammation, evaluate symptoms of infections, or check for signs of autoimmune diseases. It’s also used in screening for conditions like cardiovascular risk.

How Results Are Interpreted

Results are compared to a general reference range, though individual ranges can vary. High CRP levels may indicate active inflammation, while lower levels suggest reduced activity.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CRP’s Role in Healthcare

Short name

CRP (Serum/Plasma)

Frequently asked questions

What does a high CRP level mean?
A high CRP level often signals inflammation, which can be caused by infections, injuries, or autoimmune conditions. It may prompt further testing or adjustments to treatment plans.
Can CRP levels change over time?
Yes, CRP levels can fluctuate based on your health status, recent infections, medications, or lifestyle factors like diet and exercise. Follow-up tests may be needed to track changes.
Is CRP the same as other inflammation markers?
CRP is one of many markers; others like erythrocyte sedimentation rate (ESR) or interleukin-6 (IL-6) may also be used depending on the clinical situation.
  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