Uracil in Cerebrospinal Fluid (CSF)
This test measures the amount of uracil, a naturally occurring nucleobase, in your cerebrospinal fluid (the fluid surrounding the brain and spinal cord). It may be used to assess certain metabolic or genetic conditions affecting nucleotide metabolism.
["Uracil in CSF can help diagnose or monitor conditions linked to abnormal uracil levels in the central nervous system."]
Key facts at a glance
- LOINC
- 75128-9
- Short code
- Uracil CSF-sCnc
- Synonyms
- Uracil 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 Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms or a medical history suggestive of conditions like uraciluria (excess uracil in urine), certain genetic disorders (e.g., uracilase deficiency), or neurological concerns that could be linked to metabolic imbalances. It may also be part of a broader evaluation for conditions affecting nucleotide metabolism or inherited disorders of purine/pyrimidine metabolism.
What to Expect Before the Test
No special preparation is typically required. The test involves a lumbar puncture (spinal tap) to collect cerebrospinal fluid. You may experience mild discomfort, but it usually doesn’t require sedation. Follow your provider’s instructions regarding medications or activities to avoid before the procedure.
What the Test Results Mean
Results are interpreted by your healthcare provider based on your clinical context. Elevated uracil levels in CSF may indicate metabolic disorders, genetic conditions, or other underlying issues affecting nucleotide metabolism. Abnormal results will guide further testing or treatment planning.
Common Conditions Monitored or Diagnosed
This test is less commonly used alone but may be part of a diagnostic workup for conditions like uracilase deficiency, certain lysosomal storage disorders, or metabolic syndromes affecting purine/pyrimidine pathways. It can also help evaluate patients with unexplained neurological symptoms or genetic testing results suggestive of nucleotide-related disorders.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical significance: Elevated uracil in CSF may signal metabolic disorders disrupting nucleotide homeostasis, particularly in inherited conditions. Low or normal levels are generally expected in healthy individuals but require clinical correlation. Always discuss results with your provider, as interpretation depends on your symptoms, medical history, and other test findings.
Short name
Uracil CSF
Frequently asked questions
How is uracil in CSF typically measured?
What causes uracil levels in CSF to be elevated?
Can uracil CSF test results change over time?
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