* Sodium, Urine, Random Mnemonic U NA R Synonym Na+ - Urine Sodium Cation - Urine Sodium Electrolyte Specimen Collection Requirements Collect Urine, one sterile container without preservatives. Pediatric samples may be collected using a cotton ball. Handling Remove particulates by centrifugation prior to analysis. Preferred Volume 2.0 mL urine Minimum Volume 0.5 mL urine Transport Refrigerated (2-8°C) Stability Room Temperature (18-26°C): 7 days; Refrigerated (2-8°C): 45 days; Frozen (≤-20°C): 2 months Testing Information Performed 7 days/week Reported 24 hours Method Ion Selective Electrode Reference Values Reference Values Not Established CPT Codes 84300 Last Updated: Thursday, September 5, 2019 08:32:21 PM Client Services: 503-413-1234