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HelpTest Code LAB6036 Amino Acids, Quantitative, Spinal Fluid (CSF)
Methodology
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Performing Laboratory
St. Louis Children's Hospital - Metabolic Genetics
Specimen Requirements
Patient Preparation: None
Container/Tube
Preferred/Acceptable: 7.0 mL screw-capped, sterile, plastic CSF collection vial.
Collection Volume: 1.0 mL (minimum 0.3 mL)
Submission Container/Tube: If specimen is coming from an outside facility, process within 1 hour. Aliquot sample into a screw capped vial and freeze. Send specimen in dry ice to keep frozen.
Special Instructions: Maintain sterility and forward promptly.
Reference Values
Reference Range:
Age-dependent
See Amino Acids CSF Reference Values
Critical Values: None established
Additional Information
For SLCH Laboratory use only
Lab Processing Instructions: Centrifuge specimen to separate and aliquot supernatant into a plastic, conical vial and freeze.
Processed Volume: 1.0 mL (minimum 0.3 mL) CSF
Analyte Stability:
| Specimen Type | Temperature | Time |
|---|---|---|
| CSF (unprocessed) | Ambient | 1 hour |
| CSF (processed) | Refrigerated | NA |
| Ambient | 1 hour | |
| Frozen (preferred) | indefinitely |
Limitations
- NA
Last Reviewed
08/2025
Logistics
Day(s) Test Set Up: Monday-Friday
Cut-off time: Varies; batched once per day in a.m.
Turnaround Time: 3-5 days
Sample Rejection
Mislabeled or unlabeled specimen
Test Classification and CPT Coding
82139
Test Classification: This test was developed and its performance characteristics determined by St. Louis Children's Hospital Clinical Laboratory. It has not been cleared or approved by the U.S. Food and Drug Administration.
LOINC
35507-3