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HelpTest Code LAB6008 Urea Nitrogen, Dialysis, Body Fluid
Performing Laboratory
St. Louis Children's Hospital Laboratory - Chemistry
Specimen Requirements
Patient Preparation: None
Collection Container/Tube:
Preferred: Plain, red-top tube
Acceptable: LiHep syringe or sterile screw-capped plastic container
Specimen Collection Volume: 1.0 (minimum 0.5 mL) dialysate fluid
Submission Container/Tube: Specimen should not be coming from outside facility.
Special Instructions: Send to lab promptly at ambient temperature.
NOTE: SPECIMEN SOURCE IS REQUIRED ON REQUEST FORM FOR PROCESSING
Sample Rejection
Mislabled or unlabeled specimens
Logistics
Test Availability: Monday-Sunday
Cut-off time: None, performed as received
Turnaround Time: Same Day; 2 hours from receipt in performing lab
Reference Values
Reference Interval: No reference intervals established
Critical Value: None established
Methodology
Kinetic test (Urease with Glutamate Dehydrogenase) measured photometrically
Specimen type is not approved for use in this method by the FDA. Analytical characteristics and clinical utility have not been established
Limitations
- Ammonium ions may cause erroneously elevated results
Additional Information
FOR SLCH CORE LABORATORY USE ONLY
Lab Processing Instructions: Centrifuge specimen and aliqout minimum of 0.5 fluid into a Roche false-bottom tube for testing.
Processed Volume: minimum 0.3 mL dialysate fld
Analyte Stability:
| Specimen Type | Temperature | Time |
|---|---|---|
| dialysate fluid | Ambient | not established |
| Refrigerated | not established | |
| Frozen | not established |
NOTE: make sure order is for correct specimen type (dialysate)
Test Classification and CPT Code
84520
LOINC
Urea Nit BF: 3093-2
Fluid Type: 14725-6
Last Reviewed
07/2025