* Sodium, Blood Mnemonic NA Synonym Na+ - Serum Sodium Cation - Serum Sodium Electrolyte Specimen Collection Requirements Collect Serum or Plasma, one 5.0 mL gold (SST), 7.0 mL red or 3.0 mL mint green (lithium heparin, PST) top tube Handling Allow serum to clot completely at room temperature (minimum: SST - 30 minutes and red top tubes - 60 minutes). Preferably, separate serum or plasma from cells before transport. Preferred Volume 1.0 mL Serum or Plasma Minimum Volume 0.25 mL Serum or Plasma (0.60 mL minimum whole blood draw) Transport Refrigerated (2-8°C) Rejection Criteria Grossly hemolyzed specimens Stability AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 4 days; Refrigerated (2-8°C): 7 days; Frozen (at or below -20°C): 1 month Testing Information Performed 7 days/week Reported 24 hours Method Ion Selective Electrode Reference Values Reference Values For age related ranges see Chemistry Age Related Reference Ranges and Critical Values. Critical Values For age related ranges see Chemistry Age Related Reference Ranges and Critical Values. CPT Codes 84295 Last Updated: Saturday, January 30, 2021 02:13:45 AM Client Services: 503-413-1234