Microbiological examination of fluid (e.g., cerebrospinal fluid) for microbial detection using culture methods
This test checks for the presence of bacteria, viruses, or fungi in your cerebrospinal fluid (CSF) to help diagnose infections like meningitis or encephalitis.
["A culture helps identify infections in your brain or spinal cord fluid that may require treatment."]
Key facts at a glance
- LOINC
- 96711-7
- Short code
- RBC #/area Fld Micro
- Synonyms
- RBC #/area Fld Micro
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 4.2
- Ref high
- 5.9
- Critical range
- 2 N/A – 7 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- microscopy-light
- CPT
- 85041
- SNOMED
- 900000000000003001
- 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
Why This Test Is Done
Your healthcare provider may order this test if you have symptoms like severe headache, neck stiffness, fever, confusion, or neurological issues that could suggest an infection in your central nervous system. It’s also used after a head injury or to monitor conditions like meningitis.
What to Expect During the Test
A small amount of CSF is collected through a procedure called a lumbar puncture (spinal tap). The fluid is then sent to the lab for culture testing, which may take several days to produce results.
Preparation and Care
No special preparation is needed, but you may be asked to avoid certain medications or activities for a short time before the procedure. Follow your doctor’s instructions carefully.
Possible Results and Next Steps
If microbes are found, your doctor will determine the type and recommend appropriate antibiotics or antifungal treatment. If no infection is detected, further testing may be needed to diagnose other conditions.
Reference range
Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Microbiology CSF Culture
Frequently asked questions
What does a positive culture mean?
How long does it take to get results?
Can I take antibiotics before the 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 17, 2026. · Read our editorial policy