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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. Completed specimens are stored refrigerated for 5 days. 

Specimen Transport Temperature


LOINC Code Information

Name LOINC Code
Sodium 2951-2