Serum/plasma substance concentration (immunoassay) for inflammatory markers (e.g., C-reactive protein or similar acute-phase reactant)
This test measures substances in your blood that rise during inflammation, infection, or injury. It helps your healthcare provider assess whether your body is responding to illness or stress.
["Identifies signs of inflammation or infection that may need treatment or monitoring."]
Key facts at a glance
- LOINC
- 34682-5
- Short code
- PT imm FV DP PPP
- Synonyms
- PT imm FV DP PPP
- Category
- chemistry
- Sample
- plasma
- Container
- Lavender-top (EDTA) or Green-top (Heparin)
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- coag-tissue-factor-induced-factor-substitution-immediately-after-addition-of-factor-v-depleted-plasma
- CPT
- 85610
- SNOMED
- 396252006
- 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
What This Test Measures
This test detects levels of specific proteins or substances in your blood that increase when your body is fighting infection, healing from injury, or responding to illness. These markers can signal inflammation, immune activity, or systemic stress.
Why It’s Ordered
Your doctor may order this test to check for signs of infection (such as bacterial or viral), autoimmune conditions, tissue damage, or other inflammatory processes. It’s often used alongside other tests to guide treatment decisions.
When to Expect Results
Results typically arrive within 24 to 48 hours after your blood sample is drawn, depending on lab processing times. Your doctor will discuss the meaning of your results with you.
Common Reasons for Testing
Common reasons include fever of unknown origin, suspected infection, chronic pain or swelling, autoimmune disease screening, or monitoring treatment response in conditions like arthritis or sepsis.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Inflammatory marker screening
Frequently asked questions
Why might my levels be higher or lower than expected?
Could diet or supplements affect this test?
How often should I get this test?
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