C-reactive protein (CRP) by nephelometry in serum/plasma
This test measures the level of C-reactive protein in your blood, a protein produced by your liver in response to inflammation.
["CRP helps doctors assess inflammation, often used to monitor conditions like infections, autoimmune diseases, or after surgery."]
Key facts at a glance
- LOINC
- 92794-7
- Short code
- CGLABNAA
- Synonyms
- C glabrata DNA Bld Pos Ql NAA+probe
- Category
- chemistry
- Sample
- whole-blood
- Container
- Positive blood culture bottle (aerobic or anaerobic) flagged positive by a continuous-monitoring blood culture system; sample aliquot transferred to a sterile, leak-proof, nucleic acid–compatible transport tube for testing
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- probe-amp-tar
- CPT
- 87481
- SNOMED
- 122450008
- Specimen volume
- 1–2 mL of broth aspirated from a positive blood culture bottle (per manufacturer/instrument instructions)
- Stability
- Test as soon as possible after blood culture positivity is flagged; if delayed, refrigerate at 2–8°C and process within 24 hours per validated laboratory procedure
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 1–8 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order this test to check for signs of inflammation, monitor chronic conditions like rheumatoid arthritis or heart disease, or evaluate your response to treatment. It can also help identify infections or other inflammatory processes in your body.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if instructed by your doctor, but this is not always required for CRP. Bring any medications or questions to your appointment.
What Happens During the Test?
A small needle will be used to draw blood from a vein in your arm. The blood sample will be sent to a lab for analysis using nephelometry, a method that measures how much light is scattered by the protein in your serum or plasma.
What Are the Results?
Results are typically reported in milligrams per deciliter (mg/dL). Higher than expected levels may indicate inflammation, while lower levels may suggest reduced inflammation. Your doctor will interpret the results in the context of your overall health and medical history.
Reference range
Negative for Candida glabrata DNA (qualitative result: Detected / Not Detected). Reference result is 'Not Detected' in a positive blood culture.N/A
No special patient preparation required. Specimen is collected only when a blood culture bottle flags positive by an automated blood culture system.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
CRP (Nephelometry)
Frequently asked questions
How long does it take to get my CRP test results?
Can I eat or drink before this test?
What does a high CRP level mean?
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