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Test Code LAB122 Sodium, Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Indirect Ion-Selective Electrode (ISE)

Literature Reference:

Package insert: ISE/Na,K,Cl. Roche Corporation, 06/2014.

Specimen Requirements

Note: This test is also available as part of LAB15 Basic Metabolic Panel (BMP); LAB17 Comprehensive Metabolic Panel (CMP); LAB16 Electrolyte Panel, Plasma; and LAB19 Renal Function Panel. 

 

Specimen Type: Plasma

Container/Tube: Mint-green top (lithium heparin)
Specimen Volume: Full tube

 

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory

Test Classification and CPT Coding

84295

Reference Values

135-145 mmol/L

Critical result (automatic call-back): ≤120 mmol/L or ≥160 mmol/L

Literature Reference: 

1. Hood J, Scott MG, Klutz JS, et al. Physiology and Disorders of Water Electrolyte, and Acid-Base Cheng S, Schindler E, Scott MG. Disorders of Water Electrolyte, and Acid-Base Metabolism. In Tietz textbook of Clinical Chemistry 6th ed: Chapter 60, P. 1324, Elsevier, St. Louis, MO 2018.

2. Schindler E, Brown S and Scott MG. Electrolytes and Blood Gases. In Tietz Textbook of Clinical Chemistry 6th ed: Chapter 35, P. 604, Elsevier, St. Louis, MO 2018.

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only

Alternate Tube:
1 dark green-top (lithium heparin) tube
1 red-top tube
 

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days. 

Test performed in South County Siteman and Ambulatory Cancer Building Lab.  Centrifuge sample and deliver to the Cobas.  Completed specimens are stored refrigerated for 5 days.  

Special Instructions

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

Name LOINC Code
Sodium 2951-2