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HelpTest Code LAB446 Sodium, Urine, 24 Hour
Performing Laboratory
Barnes-Jewish Hospital Laboratory
Methodology
Indirect Ion-Selective Electrode (ISE)
Literature Reference:
Package insert: ISE/Na, K, Cl. Roche Corporation, 06/2014.
Specimen Requirements
Specimen Type: Urine, 24 hour
Container/Tube: Plain, brown urine container
Specimen Volume: Entire collection
Collection Instructions: No additive. Refrigerate specimen during collection.
Additional Information:
1. Starting and ending times of collection are required.
2. See Urine Collection information under General Information
3. Containers with preservatives are NOT acceptable..
Day(s) Test Set Up
Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory
Test Classification and CPT Coding
81050-Volume measurement for timed collection
84300-Sodium
Reference Values
Varies greatly with diet
Commonly observed levels on an average diet are 40-220 mmol/24 hours with a moderate sodium intake.
Literature Reference:
Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6 th ed: Chapter 60, p. 1324, Elsevier, St. Louis, MO 2018.
Specimen Transport Temperature
Ambient
Additional Information
For BJH Laboratory Use Only
Analyte Stability:
Collection must be kept refrigerated during the collection and before delivery to limit bacterial growth.
Laboratory Processing Instructions:
Test performed in BJH Core Lab. Mix urine well. Record volume, period, and pH on request form. Using 13x100 test tubes, prepare a 7-mL aliquot and deliver to the automated line for centrifugation and delivery to Cobas 8000 for analysis. Completed specimen is stored refrigerated for 5 days.
Special Instructions
See Urine Collection information under General Information.
See Analyte Stability Chart under General Information for a complete list.
LOINC Code Information
| Name | LOINC Code |
| Sodium in 24 hour urine | 2956-1 |
| Collection Duration | 13362-9 |
| Volume of urine | 19153-6 |