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Test Code URNA Urine Sodium, Timed

Important Note

If ordering a random collection, use order code RNA

Specimen and Container/Tube

Specimen Type: Urine, 24 Hour Timed Collection

Preferred Specimen:  24 Hour Sterile Plastic Container

Other Acceptable specimens: Sterile Clean Glass Container

Specimen Handling and Transport Instructions

UCMC Onsite Instructions: 

  • Collect specimen per standard collection procedure and send to laboratory immediately.
  • No preservatives or additives.

UCMC Offsite and UC MedLab Outreach Instructions: 

  • Samples should be centrifuged within 2 hours of collection
  • No preservatives or additives
  • Aliquot 10.0 mL of well mixed urine into plastic tube. 
  • Urine samples must then be sent refrigerated at 2-8oC.

Rejection Criteria

  • Common specimen rejected situations include: incorrect specimen type, insufficient volume, missing or incomplete specimen identifiers, incorrect specimen transport, or specimens outside stability limits. 
  • Specimens that are collected with preservatives or additives.

Reference Values

 

Test

Age

Sex

Reference Range

Urine Sodium Timed

All

All

40 - 220 mmol/24hr 

Critical Values

Not applicable

CPT Codes

84300

LOINC Codes

2955-3, 2956-1

Volume

Preferred Volume: 10.0 mL

Minimum Volume: 1.0 mL

Specimen Stability

Storage Temperature

Stability

Room temperature

14 days

Refrigerated

14 days

Frozen

not preferred

Collection Instructions

  • Provide 24-hour urine collection instructions and container to patient.
  • Collect specimen per standard laboratory collection procedures. 
  • No preservatives or additives.
  • Keep 24 hour urine refrigerated during collection process. 

Test Components

Urine collection duration, Urine total volume, Urine sodium random, Urine sodium timed 

Clinical Indications

Useful in the assessment of fluid balance.

Methodology

Ion Specific Electrode (ISE) (Roche Diagnostics)

Turnaround Time

Turnaround times are relative to the time the specimen is received in the test laboratory. 

STAT Turnaround Time: 1 hour

Routine Turnaround Time: 4 hours

Testing Schedule: 24/7

Additional Information

Not applicable

Synonyms/Keyword Search

24 hour urine sodium 

Last Review Date

4/7/2025