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Cerebrospinal Fluid Culture (Microbiological Examination for Pathogens)

Published: August 9, 2026Updated: August 16, 2026

This test checks for bacteria, fungi, or other microbes in your cerebrospinal fluid (CSF), which is the fluid surrounding your brain and spinal cord. It helps determine if an infection or inflammation is present.

Quick summary

["This test helps diagnose infections like meningitis or other brain/spinal cord issues caused by germs."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
31299-1
Short code
C pneum IgA CSF-aCnc
Synonyms
C pneum IgA CSF-aCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why It’s Done

Your doctor may order this test if you have symptoms like severe headache, neck stiffness, fever, confusion, or sensitivity to light. It’s also used after a head injury or to monitor conditions like meningitis or brain abscesses.

How It’s Done

A small amount of CSF is collected through a procedure called a lumbar puncture (spinal tap). A needle is inserted into your lower back, and fluid is taken from the spinal canal. The sample is then sent to the lab for culture testing.

What to Expect

You may feel pressure or a slight ache where the needle was inserted. You might experience mild back pain or a headache afterward. Avoid strenuous activity for a few hours after the procedure.

Possible Results

If microbes are found, it confirms an infection. If no growth is detected after several days, it suggests no active infection is present. Results can take days to weeks, as cultures require time to grow.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Culture

Frequently asked questions

What does a positive result mean?
A positive culture result indicates the presence of bacteria, viruses, fungi, or other pathogens in your CSF, which could mean you have meningitis, an abscess, or another serious infection. Treatment may include antibiotics, antivirals, or antifungal medications.
What does a negative result mean?
A negative culture result means no visible growth of microbes was detected after testing. However, it doesn’t rule out all possible infections—some may take longer to grow or require special techniques. Follow-up tests or repeat cultures may be needed.
How often is this test repeated?
This test is typically done once, but your doctor may order it again if symptoms persist or if further investigation is needed. Repeat cultures are usually only recommended if initial results are unclear or if you develop new symptoms.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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