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HelpTest Code LAB6555 Sulfite, Urine
Performing Laboratory
St. Louis Children's Hospital Laboratory - Metabolic Genetics
Specimen Requirements
Patient Preparation: None
Container/Tube:
Preferred/Acceptable: Clean, plastic screw-cap urine collection container with no preservatives
Specimen Volume: 1.0 (minimum 0.5 mL) urine
Submission Container/Tube: Specimen may not be received from outside facility due to stability.
Special Instructions: Send to lab STAT.
Sample Rejection
Specimen received after 1330 Monday-Friday (without approval) or anytime Saturday, Sunday, or day of Holiday
Specimens collected with preservative
Mislabled or unlabeled specimens
Logistics
Test Availability: Monday-Friday 0600-1330
Cut-off time: 1330
Turnaround Time: Same Day; 1 hour from receipt in lab
Reference Values
Reference Interval: Negative (<10 mg/L)
Critical Value: None established
Methodology
Colorimetric, Qualitative
Limitations
- False positive results may occur on patients receiving some antibiotics, like cefotaxime, cefuroxime, ampicillin and benzylpenicillin.
- Highly colored urine will discolor the reacton zone of test strip which may lead to false positive results.
Additional Information
FOR SLCH CORE LABORATORY USE ONLY
Lab Processing Instructions: DO NOT SPIN. Give specimen to Metabolic Genetics Laboratory immediately.
Processed Volume: 1.0 mL (minimum 0.5 mL) urine
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| urine (no preservative) | Ambient | 15 minutes |
| Refrigerated | 30 minutes | |
| Frozen | NA |
Test Classification and CPT Code
81002
LOINC
58457-3
Test Classifcation: 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.
Last Reviewed
08/2025