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Test Code LAB436 Potassium, 24 Hour Urine

Useful For

  • Evaluating the electrolyte composition of urine
  • Electrolyte balance studies

Methodology

Ion-Selective Electrode (ISE)

Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Urine
Container/Tube: 24-hour urine collection container
Specimen Volume:

Preferred: 10 mL

Acceptable: Entire collection
Specimen Minimum Volume: 1 mL
Collection Instructions:

  1. Starting and ending times of collection are required.
  2. Collect a 24-hour urine specimen.
  3. No preservative.
  4. Refrigerate specimen during collection.
  5. Mix well before taking aliquot.
  6. Centrifuge specimen before analysis.
  7. Follow special collection instructions below.

Special Instructions

Specimen Transport Temperature

Refrigerated

Specimen Stability

Specimen Type Temperature Time
24-hour urine Ambient 14 days
  Refrigerated 14 days
  Frozen 1 year

Reference Values

25.0-125.0 meq/24 hours

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

84133-Potassium

81050-Urine timed measurement (if appropriate)