Cystine in Cerebrospinal Fluid (CSF) Concentration

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

This test measures the amount of cystine, a sulfur-containing amino acid, in your cerebrospinal fluid (the fluid surrounding the brain and spinal cord). It may be used to diagnose or monitor conditions affecting the central nervous system.

Quick summary

["This test helps assess potential genetic or metabolic disorders linked to cystine buildup in the nervous system."]

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

Key facts at a glance

LOINC: 22653-0
Short code: Cystine CSF-sCnc
Synonyms: Cystine 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 Is This Test Done?

Your healthcare provider may order this test if you have symptoms like headaches, vision problems, or neurological issues that could be linked to cystine accumulation. It’s also used in research or specialized care for rare genetic disorders like cystinosis.

What to Expect Before the Test

No special preparation is needed. The test involves a simple lumbar puncture (spinal tap) where fluid is collected from your lower back. You may feel mild pressure or discomfort, but it’s usually brief.

What the Test Results Mean

Elevated cystine levels in CSF could indicate conditions like cystinosis or other metabolic disorders affecting amino acid transport. Results are interpreted by your doctor in the context of your symptoms and medical history.

Common Conditions Monitored

This test is primarily used in research or specialized care for rare genetic disorders, such as cystinosis, where cystine buildup in organs (including the nervous system) can cause health problems.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Elevated cystine in CSF may suggest a genetic disorder affecting amino acid metabolism, particularly in cases where systemic cystine levels are also abnormal. It’s critical for diagnosing or guiding treatment in rare inherited conditions.

Short name

Cystine CSF

Frequently asked questions

What causes abnormal cystine levels in CSF?

Abnormal levels are most commonly associated with genetic disorders like cystinosis, where the body fails to properly clear cystine. Rarely, other metabolic or neurological conditions may be linked.

How is cystine CSF tested?

The test involves collecting cerebrospinal fluid via a spinal tap. The fluid is then analyzed for cystine concentration using specialized laboratory techniques, often chromatography or immunoassay methods.

Can diet or medications affect cystine CSF levels?

Dietary factors or common medications typically do not directly affect cystine CSF levels. However, certain treatments (like cysteamine) for cystinosis may influence systemic cystine levels but not necessarily CSF levels alone.

Sources

1
MedlinePlus — Laboratory TestsSource
2
Lab Tests OnlineSource
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