Blood Culture with Specific Gram-Negative Bacteria Identification (Qualitative)
This test checks for the presence of certain bacteria in your blood that are typically resistant to staining with Gram’s stain, often linked to infections like urinary tract infections, gastrointestinal issues, or sepsis.
["A blood culture helps identify infections caused by bacteria that don’t stain blue/purple under a microscope, guiding treatment decisions."]
Key facts at a glance
- LOINC
- 75673-4
- Short code
- Deprecated GN Bld Culture Pnl Bld Pos Prb Mag
- Synonyms
- Deprecated GN 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 This Test Is Done
Your healthcare provider may order this test if you have symptoms of a serious infection, such as fever, chills, or signs of sepsis (like rapid breathing or confusion). It’s also used in monitoring patients with ongoing health conditions that increase infection risk, like chemotherapy or organ transplants.
How the Test Works
A small sample of your blood is collected and placed in special containers that support the growth of bacteria. Over 48–72 hours, lab technicians check for signs of bacterial growth, which would indicate an infection.
What to Expect Before the Test
You may feel slight discomfort during the blood draw, but no special preparation is needed. If you’re on antibiotics, let your provider know—it may affect results.
What to Expect After the Test
Results are typically ready within 48–72 hours. If bacteria are found, your doctor will determine the best treatment, such as antibiotics tailored to the specific bacteria identified.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for diagnosing infections caused by Gram-negative bacteria, which can be harder to treat than other types. Early identification helps prevent complications like organ damage or prolonged illness, ensuring targeted and effective treatment.
Short name
Gram-Negative Bacteria Blood Culture
Frequently asked questions
How long does it take to get results from this test?
What symptoms might indicate this test is needed?
Can I eat or drink 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