C-reactive protein (CRP) – Serum/Plasma Concentration
This test measures a protein produced by your liver in response to inflammation or infection. It helps doctors assess whether you have low-grade inflammation that may not be causing obvious symptoms.
["CRP helps track subtle inflammation, often used alongside other tests for conditions like heart disease or autoimmune disorders."]
Key facts at a glance
- LOINC
- 75732-8
- Short code
- HTR2C c.-759C>T Bld/T Ql
- Synonyms
- HTR2C c.-759C>T Bld/T Ql
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- molgen
- 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
What Is CRP Used For?
High-sensitivity CRP (hs-CRP) is particularly useful for monitoring chronic inflammation in conditions like cardiovascular disease, where inflammation may not be immediately visible. It can also be part of a broader evaluation for autoimmune diseases or after certain surgeries to check for lingering inflammation.
How Is CRP Different from Standard CRP?
High-sensitivity CRP is more sensitive than standard CRP, meaning it can detect smaller amounts of inflammation in your blood. This makes it useful for conditions where inflammation is present but not severe enough to trigger a strong immune response.
When Might You Need This Test?
Your doctor may order this test if you have risk factors for heart disease, such as high cholesterol, diabetes, or a family history of heart problems. It may also be used to monitor treatment progress for conditions like rheumatoid arthritis or after a heart attack to check for ongoing inflammation.
What Could Affect CRP Levels?
Several factors can influence CRP levels, including infections (like colds or urinary tract infections), injuries, recent surgeries, or certain medications (like steroids). Stress, smoking, and obesity can also temporarily raise CRP levels.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
CRP (High Sensitivity)
Frequently asked questions
Why did my doctor order a high-sensitivity CRP test?
What are the typical reference ranges for CRP?
Can CRP levels change with diet or lifestyle changes?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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