Platform
Company
Body Fluids
Review status
Currently under review
Pending specialist review and validation.
This test measures the amount of asparagine, an amino acid, in your cerebrospinal fluid (CSF). CSF is the clear fluid that surrounds and protects your brain and spinal cord. Asparagine is involved in protein building and cellular signaling, and its balance in CSF reflects how amino acids are made, used, and transported within the central nervous system.
Your sample is obtained during a lumbar puncture and analyzed in a specialized laboratory, often alongside other amino acids. Results can help your care team understand how your brain and spinal cord handle amino acids, which can differ from what is seen in blood.
Doctors may order CSF asparagine testing when there are concerns about a neurometabolic condition, unexplained seizures, developmental concerns, or other signs that suggest disrupted amino acid metabolism in the brain. The test can also be used to monitor the effect of certain cancer treatments, such as asparaginase for acute lymphoblastic leukemia, which lowers asparagine levels as part of its therapeutic action.
Changes in CSF asparagine can reflect problems with amino acid production, transport across the blood brain barrier, or increased demand within the central nervous system. When interpreted with your symptoms, exam findings, imaging, and other laboratory tests, it can guide further evaluation and treatment decisions.
Your clinician will interpret your CSF asparagine result in the context of why the test was ordered and other findings. A lower than expected value can be seen after treatment with asparaginase or in rare genetic conditions that affect asparagine production. A higher than expected value can occur with blood contamination of the CSF sample, increased protein breakdown, or inflammation in the central nervous system.
One result rarely provides the full picture. Your team may compare CSF findings with blood amino acids, repeat testing if the sample was difficult to obtain, or add genetic and metabolic studies when needed. If your result is outside the expected range, ask how it fits with your overall evaluation and whether any changes to treatment or follow-up are recommended.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Asparagine can degrade if the CSF sample is not promptly processed and kept cold. Rapid freezing and avoiding delays in transport reduce breakdown and provide more reliable results.
A traumatic or difficult lumbar puncture can introduce blood into CSF, altering amino acid concentrations. Your lab may note visible blood or measure red cells to help interpret results.
Cancer treatments that use asparaginase intentionally lower asparagine. Timing of your last dose strongly influences results and should be shared with the laboratory and clinician.
Total parenteral nutrition, high protein intake, or catabolic states can shift amino acid patterns. Providing details on recent diet or nutrition support helps with interpretation.
Infants and young children can have different CSF amino acid patterns compared with adults. Age-specific interpretation is important when evaluating pediatric results.
Meningitis, encephalitis, or inflammatory conditions can change transport of amino acids across the blood brain barrier, which may raise or lower CSF asparagine.
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