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Purines and Pyrimidines Panel, Cerebrospinal Fluid

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

A specialized cerebrospinal fluid test that measures purine and pyrimidine metabolites to help evaluate suspected inherited disorders of nucleotide metabolism.

Quick summary

["This test analyzes purine and pyrimidine metabolites in cerebrospinal fluid to help investigate certain rare inherited metabolic disorders."]

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

Key facts at a glance

LOINC
79668-0
Short code
Purine + Pyrimidine Pnl CSF
Synonyms
Purine + Pyrimidine Pnl CSF
Category
urine
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is this test?

This test measures substances derived from purines and pyrimidines, which are chemical building blocks used to make DNA and RNA. It is performed on cerebrospinal fluid, the fluid surrounding the brain and spinal cord.

Why might I need this test?

A clinician may order this test when symptoms suggest an inherited problem in purine or pyrimidine metabolism. It may be considered alongside urine testing, genetic testing, and other laboratory studies.

How is the test performed?

Cerebrospinal fluid is usually collected through a lumbar puncture, also called a spinal tap. A laboratory then analyzes the sample for purine and pyrimidine-related substances.

How do I prepare for the test?

There is generally no special preparation unless your clinician gives you specific instructions. The lumbar puncture may require you to lie on your side or bend forward, and you will usually be monitored afterward for headache or other temporary effects.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal or unexpectedly low levels of certain purine or pyrimidine metabolites may suggest an inherited enzyme defect or another problem affecting nucleotide metabolism. Results can also be influenced by medications, recent illness, diet, and sample handling, so they must be interpreted with symptoms and other test findings by a qualified clinician.

Short name

Purine/Pyrimidine Panel, CSF

Frequently asked questions

Does this test require fasting?
Fasting is not usually required, but your clinician may recommend dietary restrictions for a specific metabolic evaluation. Follow the instructions provided with your test order.
Is a lumbar puncture painful?
A lumbar puncture can cause brief pressure or discomfort, although local anesthetic is generally used to reduce pain. Headache, dizziness, or nausea can occur temporarily afterward.
Can this test diagnose a genetic disorder by itself?
No. The panel can provide important metabolic clues, but a confirmed diagnosis may also require urine studies, enzyme testing, genetic testing, and clinical evaluation.
  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