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Test Code 1562 Sodium, Urine, 24 Hour

Performing Laboratory

Barnes-Jewish Hospital Laboratory


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. Follow instructions in Urine Collection in Special Instructions.

3. Brown urine container with green label (6N HCl) is 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

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:

Tietz, Burtis CA, Ashwood ER, Bruns DE eds: Textbook of Clinical Chemistry and Molecular Diagnostics 5th ed: Chapter 49, p. 1609, Elsevier, St. Louis, MO, 2012.

Test Classification and CPT Coding

81050-Volume measurement for timed collection


Additional Information

For BJH Laboratory Use Only

Analyte Stability:

See Analyte Stability Chart in Special Instructions.

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.

Specimen Transport Temperature


LOINC Code Information

Name LOINC Code
Sodium in 24 hour urine 2956-1
Collection Duration 13362-9
Volume of urine 19153-6