Blood Culture with Specific Gram-Positive Bacteria Identification (Probe)
This test checks for the presence of certain bacteria that are typically gram-positive (staining pink under a microscope) in your blood. It helps identify infections caused by these bacteria, which can require specific antibiotics.
["A blood culture helps detect infections by bacteria that may need targeted treatment."]
Key facts at a glance
- LOINC
- 74749-3
- Short code
- Deprecated GP Bld Culture Pnl Bld Pos Prb Mag
- Synonyms
- Deprecated GP Bld Culture Pnl Bld Pos Prb Mag
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-mag-capture
- 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
Why is this test done?
Your healthcare provider may order this test if you have symptoms like fever, chills, or unexplained infections. It’s also used when you have conditions that increase your risk of blood infections, such as weakened immune systems or recent surgeries.
What does the test involve?
A small sample of your blood is drawn and placed in special containers that encourage bacterial growth. These containers are then incubated in a lab to detect any bacteria present.
How long does it take to get results?
Results can take several days to a week, depending on the growth of bacteria and lab processes. You’ll be notified once results are available, usually by your healthcare provider.
What are the risks?
The main risk is a minor reaction at the injection site, such as redness or swelling. Rarely, blood cultures can cause infections at the needle site or allergic reactions to the medium used.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical significance: This test is critical for diagnosing serious bloodstream infections, guiding appropriate antibiotic treatment, and preventing complications like sepsis. It helps ensure you receive the right medications to fight the infection effectively.
Short name
Gram-positive bacteria blood culture screening
Frequently asked questions
How often can I get this test?
What if my blood culture comes back negative?
Can I take antibiotics before 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