C-reactive protein (CRP) with high-sensitivity measurement by turbidimetry
This test measures a protein produced by your body in response to inflammation, helping assess low-level inflammation or infection.
["High-sensitivity CRP helps track subtle inflammatory activity that may not be detected by other tests."]
Key facts at a glance
- LOINC
- 103169-9
- Short code
- CFREUND
- Synonyms
- C freundii DNA Wnd Ql NAA+probe
- Category
- chemistry
- Sample
- serum
- Container
- Sterile, leak-proof container or swab transport system (e.g., ESwab, Copan swab, or sterile saline for tissue/aspirate)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- probe-amp-tar
- CPT
- 87798
- SNOMED
- 122456007
- Specimen volume
- 1-3 mL of wound exudate, aspirate, or tissue biopsy; swab specimens collected per device manufacturer guidelines
- Stability
- Room temperature: 24 hours; Refrigerated (2-8°C): 7 days; Frozen (-70°C or below): 30 days. Transport to laboratory as soon as possible to preserve nucleic acid integrity.
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–72 hours
- Order
- routine
Why Is This Test Done?
Your doctor may order this test to monitor chronic conditions like heart disease, arthritis, or autoimmune disorders, or to check for signs of infection or inflammation before surgery or other procedures.
What Does the Result Mean?
Results are not provided as a single numeric range since reference intervals vary by lab and patient factors. Elevated levels may indicate inflammation, infection, or other health concerns requiring further evaluation.
What to Expect Before the Test
No special preparation is needed. You may eat and drink normally. If you’re taking blood, a healthcare provider will explain the process and any precautions.
What to Expect During the Test
Blood is drawn from a vein in your arm. You may feel a slight pinch, but it usually takes only a few minutes. You can resume normal activities afterward.
Reference range
Negative (Not Detected) for Citrobacter freundii DNAN/A
No fasting required. Avoid contaminating the wound sample with skin flora prior to collection. Discontinue topical antibiotics or antiseptic dressings at least 24 hours before specimen collection if clinically feasible. Inform the laboratory of any recent antimicrobial therapy.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: Inflammation and Risk Assessment
Short name
hs-CRP
Frequently asked questions
What does a high or low CRP level mean?
Can CRP levels change over time?
Is fasting required for 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