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Orotic Acid in Cerebrospinal Fluid (CSF) by Substance Concentration

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

This test measures the amount of orotic acid, a chemical involved in the body’s production of certain building blocks for DNA and other molecules, found in your cerebrospinal fluid.

Quick summary

["Orotic acid levels in CSF may help diagnose or monitor metabolic conditions affecting DNA synthesis."]

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

Key facts at a glance

LOINC
75148-7
Short code
Orotidine CSF-sCnc
Synonyms
Orotidine 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 a history suggestive of metabolic disorders, such as orotic aciduria—a rare genetic condition where the body cannot properly break down orotic acid. It may also be used in research or specialized clinical settings to assess metabolic pathways in the brain’s fluid.

What Does Orotic Acid in CSF Represent?

Orotic acid is a natural substance that can accumulate in the CSF when metabolic processes are disrupted. Elevated levels may indicate an enzyme deficiency or other inherited metabolic disorders that interfere with nucleotide production.

How Is the Test Performed?

A small amount of cerebrospinal fluid is collected via a procedure called lumbar puncture (spinal tap). The fluid is then analyzed in a lab to measure orotic acid concentration using a specialized method, likely high-performance liquid chromatography (HPLC).

What Are Common Causes of Abnormal Results?

Abnormally high orotic acid in CSF is most strongly linked to inherited metabolic disorders like orotic aciduria. Other conditions, such as certain genetic mutations affecting nucleotide metabolism, may also contribute. Low or normal levels are less commonly associated with clinical concerns unless part of a broader metabolic evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Orotic Aciduria and Beyond

Short name

Orotic Acid CSF

Frequently asked questions

What symptoms or conditions might this test help identify?
This test is primarily used to diagnose orotic aciduria, a rare genetic disorder causing symptoms like developmental delays, anemia, or neurological issues. Early detection through CSF analysis can guide treatment and management strategies.
How often is this test repeated, and what does it measure over time?
If abnormal results are found, follow-up testing may be scheduled to monitor progression or response to treatment. Results are typically interpreted in the context of clinical symptoms, family history, and other diagnostic tests. Levels may be checked periodically if ongoing metabolic monitoring is required.
Can lifestyle changes affect orotic acid levels in CSF?
No, orotic acid in CSF is not influenced by diet or lifestyle changes in the same way blood-based metabolites might be. This test focuses on the CSF-specific concentration, which reflects metabolic processes in the central nervous system and is not directly affected by general dietary habits.
  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