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Test Code 1884 Sodium, Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory


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 #1851 Basic Metabolic Panel (BMP); #6961 Comprehensive Metabolic Panel (CMP); #1099 Electrolyte Panel, Plasma; and #6970 Renal Function Panel. See Common Panel Test Combinations in Special Instructions to avoid duplicate test requests when multiple panels are ordered.


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

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 Metabolism.  In Tietz textbook of Clinical Chemistry 5th ed: Chapter 49, P. 1609, Elsevier, St. Louis, MO 2012.

2. Tietz, Burtis CA, Ashwood ER, Bruns DE eds: Textbook of Clinical Chemistry and Molecular Diagnostics 5th ed: Chapter 28, p. 807, Elsevier, St. Louis, MO 2012.

Test Classification and CPT Coding


Additional Information

For BJH Laboratory Use Only

Alternate Tube:
1 dark green-top (lithium heparin) tube
1 red-top tube
Analyte Stability: 
See Analyte Stability Chart in Special Instructions.

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Test performed in North Campus Laboratory. Centrifuge upon receipt and deliver to the Modular. Completed specimens are stored refrigerated for 5 days. 

Specimen Transport Temperature


LOINC Code Information

Name LOINC Code
Sodium 2951-2