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Cerebrospinal Fluid Glucose (Substance Concentration)

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

This test measures the amount of glucose (sugar) in your cerebrospinal fluid (CSF), which is the fluid surrounding your brain and spinal cord. It helps assess conditions like infections, inflammation, or blood-brain barrier issues.

Quick summary

["Glucose levels in CSF can signal potential neurological problems."]

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

Key facts at a glance

LOINC
78964-4
Short code
NAAG CSF-sCnc
Synonyms
NAAG CSF-sCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Matters

Glucose in the CSF is typically lower than in blood because the blood-brain barrier regulates its entry. Abnormal levels may indicate conditions such as meningitis, encephalitis, or subarachnoid hemorrhage.

What to Expect Before the Test

No special preparation is needed. Your healthcare provider will collect a small sample of CSF through a procedure called a lumbar puncture (spinal tap), usually done in a hospital setting.

How the Test Works

The sample is analyzed to measure glucose concentration using a method like enzymatic or electrochemical techniques. Results help diagnose or monitor neurological conditions.

Common Conditions Monitored

High glucose levels in CSF may suggest infections (e.g., bacterial or viral meningitis), while low levels could indicate bleeding, tumors, or other neurological disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical in diagnosing and managing conditions affecting the central nervous system, such as infections, inflammatory diseases, or traumatic injuries.

Short name

CSF Glucose

Frequently asked questions

What causes abnormal CSF glucose levels?
Abnormal CSF glucose levels can result from infections (e.g., bacterial or viral meningitis), blood in the CSF (e.g., subarachnoid hemorrhage), or certain tumors. Your doctor will consider other test results and symptoms for a full diagnosis.
How often should I get this test?
Frequency depends on your medical condition. If you have a chronic neurological issue, your doctor may recommend regular monitoring. If you’re undergoing treatment for an acute condition, tests may be done more frequently.
Can lifestyle changes affect this test?
Generally, lifestyle factors like diet or exercise don’t directly impact CSF glucose levels. However, if you have diabetes, blood sugar management may indirectly affect overall health but not this specific test result.
  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