Skip to content

Beta-Glucuronidase Activity in Cerebrospinal Fluid (CSF)

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

This test measures the activity of an enzyme called beta-glucuronidase in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). It may be used to help diagnose certain conditions affecting the central nervous system.

Quick summary

["This test helps assess enzyme activity in spinal fluid, potentially indicating inflammation or infection in the brain and spinal cord."]

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

Key facts at a glance

LOINC
11209-4
Short code
BGLCRSF
Synonyms
B-Glucuronidase CSF-cCnc
Category
chemistry
Sample
csf
Container
Sterile CSF collection tube, preferably polypropylene, tube #3 or #4 (following cell count tube for chemistry/lysosomal enzyme analysis)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
≥ 0 years
Method
Enzymatic assay (spectrophotometric/fluorometric measurement of beta-glucuronidase activity)
CPT
83789
SNOMED
104008009
Specimen volume
0.5-1 mL of cerebrospinal fluid
Stability
Process immediately or freeze at -70°C. Stable for limited time at 2-8°C (typically ≤24 hours); prolonged storage requires freezing at -70°C to preserve enzymatic activity. Avoid repeated freeze-thaw cycles.
Hemolysis max
200
TAT
48–168 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test if they suspect conditions like meningitis, encephalitis, or other infections that can cause inflammation in the central nervous system. It may also be considered in cases of suspected metabolic disorders or genetic conditions affecting enzyme function.

What to Expect Before the Test

No special preparation is typically needed. You may be asked to lie down on your side with your head slightly tilted back to collect the cerebrospinal fluid through a procedure called a lumbar puncture (spinal tap). This is usually done in a hospital setting under sterile conditions.

What the Test Involves

A small amount of cerebrospinal fluid is collected via a needle inserted into your lower back. The fluid is then sent to the lab for analysis. The lab measures the enzyme activity level in the sample.

What the Results Mean

Results are not typically provided as a single numeric range since enzyme activity can vary based on the specific condition and individual health. Your healthcare provider will interpret the results in the context of your symptoms and medical history.

Reference range

Reference range not well established; values vary by laboratory methodology. Typically reported in units of activity per volume (U/L or mU/L).N/A

Specimen: csf

No fasting required. Lumbar puncture performed under standard sterile technique by qualified healthcare provider. Patient should remain still during the procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated beta-glucuronidase activity in CSF can be associated with certain infections (like tuberculosis or fungal meningitis), metabolic disorders, or genetic conditions. Lower than expected levels might suggest certain genetic enzyme deficiencies. This test is often used as part of a broader diagnostic evaluation.

Short name

CSF Beta-Glucuronidase

Frequently asked questions

What causes beta-glucuronidase levels to be tested?
Beta-glucuronidase levels in CSF are primarily tested when there is suspicion of central nervous system infections, metabolic disorders, or genetic conditions affecting enzyme function. Your doctor may recommend it if you have symptoms like fever, headache, stiff neck, or neurological symptoms.
How is the cerebrospinal fluid collected for this test?
The fluid is collected through a procedure called a lumbar puncture (spinal tap). A healthcare provider inserts a needle into your lower back to draw a small amount of fluid from the spinal canal.
Are there any risks or side effects associated with this test?
Common risks include mild headache, bruising, or soreness at the injection site. Rarely, there may be complications such as infection or spinal headache, though these are uncommon with proper medical care.
  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