Thymine in Cerebrospinal Fluid (CSF) Concentration
This test measures the amount of thymine, a type of nitrogenous base found in DNA, in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). It may be used in certain diagnostic evaluations.
["This test helps assess metabolic or genetic conditions affecting DNA/RNA processing in the central nervous system."]
Key facts at a glance
- LOINC
- 75153-7
- Short code
- Thymine CSF-sCnc
- Synonyms
- Thymine 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 Might This Test Be Ordered?
Your healthcare provider may recommend this test if you have symptoms or conditions linked to abnormal DNA/RNA metabolism, such as neurological disorders, genetic syndromes, or suspected metabolic diseases. It could also be part of a broader evaluation for unexplained symptoms like developmental delays, seizures, or movement disorders.
What Does the Test Involve?
A small amount of cerebrospinal fluid is collected via a procedure called a lumbar puncture (spinal tap). The fluid is then analyzed in a lab to measure thymine concentration. This is typically done under sterile conditions to ensure accuracy.
What to Expect Before the Test
You may be asked to fast for a few hours before the procedure, though this is less common for CSF tests. Inform your provider about any medications you’re taking, as some may affect results or increase risks. Wear comfortable clothing with loose sleeves for ease of access.
What to Expect During the Test
The procedure involves lying on your side with your back bent slightly. A needle is inserted into your lower back to collect fluid. You may feel pressure or a mild sting, but the procedure itself is usually brief. You’ll be monitored closely for any complications.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Thymine CSF Level
Frequently asked questions
Thymine levels in CSF can be elevated in certain genetic disorders that impair DNA/RNA synthesis or processing, such as mitochondrial diseases or certain lysosomal storage disorders. Abnormal results may help identify underlying metabolic or neurological conditions that require further testing or treatment.
The procedure itself is generally uncomfortable but not excruciating. You may feel some pressure or a slight ache afterward, but most people describe it as manageable. Your provider will discuss pain relief options if needed.
Results from this test are typically available within a few days to a week, depending on lab processing times. Your healthcare provider will contact you once results are ready and discuss any findings.
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