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Lysine concentration in cerebrospinal fluid

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

This test measures the amount of lysine, an essential amino acid, in your cerebrospinal fluid (CSF). It may be ordered to help diagnose or monitor conditions affecting the central nervous system.

Quick summary

["Lysine levels in CSF can provide clues about metabolic or genetic disorders involving amino acids."]

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

Key facts at a glance

LOINC
26595-9
Short code
OH-Lysine CSF-sCnc
Synonyms
OH-Lysine 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 like developmental delays, seizures, or neurological issues that could be linked to amino acid disorders. It may also be used in research or specialized diagnostic settings for rare metabolic conditions.

What to Expect Before the Test

No special preparation is typically required. You may have a small amount of CSF drawn from your spine (lumbar puncture) under sterile conditions. The process is usually quick but may cause mild discomfort.

What the Results Mean

Results are compared to a reference range for healthy individuals. Abnormal levels might suggest conditions like aminoacidopathies, lysosomal storage disorders, or other metabolic issues affecting amino acid metabolism.

Common Conditions Monitored

While less common, elevated or low lysine in CSF can be associated with rare genetic disorders that disrupt amino acid processing in the brain. This test is often part of a broader diagnostic workup.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Lysine in CSF is rarely a standalone diagnostic test but may be included in specialized evaluations for suspected metabolic disorders. Abnormal findings would prompt further genetic testing or metabolic studies to identify underlying causes.

Short name

CSF Lysine

Frequently asked questions

What causes abnormal CSF lysine levels?
Abnormal CSF lysine levels can result from inherited metabolic disorders, certain genetic mutations affecting amino acid transport, or conditions that disrupt normal CSF composition. Rarely, it may also be linked to acquired neurological diseases.
How is this test different from blood lysine levels?
CSF lysine testing focuses specifically on the amino acid concentration in the fluid surrounding the brain and spinal cord, which can differ from blood levels due to selective transport mechanisms. Blood tests are more commonly used for general amino acid screening.
Can lifestyle changes affect CSF lysine levels?
Lifestyle factors like diet may indirectly influence amino acid metabolism, but direct effects on CSF lysine levels are not well-documented. This test is primarily used for diagnostic purposes rather than monitoring lifestyle changes.
  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