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Test Code UNA24H Sodium, Urine, 24 Hour, LAB446


Indirect Potentiometric

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: 24-hour urine collection

Specimen Volume: 0.2 mL from a 24-hour timed urine collection. No preservative.

                               Refrigerate specimen during collection, and send specimen refrigerated.

Stability: 24 hour urine collection for sodium should be made without addition of preservatives.

               Store at 2-8ºC or frozen for delayed analysis.

Collection Instructions: Obtain 24-hour urine jug from laboratory

Note: 1. Starting and ending times of collection are required for processing.

           2. When a 24-hour urine for sodium is done, a PV (period and volume) must also be

               ordered and resulted.(FOR LAB USE ONLY).

Reference Values

40-220 mmol/24 hours

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

81050-Timed urine measurement


Useful For

Separated specimens should be analyzed immediately or kept at room temperature for 7 days or 2 – 8 °C and analyzed within 2 weeks. For longer storage, samples may be frozen at -20 °C for up to 6 months.