Sign in →

Test Code 152 Sodium (Na+)  

Additional Codes


PowerChart: Sodium Level

MA Cerner: Sodium Level.

Specimen Requirement

0.5 mL serum or plasma is required.

Additional Specimen Collection Information

Collect blood in a lithium heparin, green-top or red-top tube. PST and SST (gel tubes) are acceptable. Serum or plasma should be separated from contact with the cells within 2 hours of collection. Specimens not centrifuged within 4 hours of collection may be rejected. Refrigerate the specimen if unable to assay within 8 hours of collection. Samples with >3+ lipemia must be cleared prior to analysis.

Useful For

Sodium assays are important in assessing acid-base balance, water balance, water intoxication, and dehydration.


Testing is performed Monday through Sunday.

Routine orders: Typically completed within 4 hours after the specimen arrives at the testing site.

Expedite: Typically completed within 1 hour after the specimen arrives at the testing site.

STAT: Typically completed within 30 minutes after the specimen arrives at the testing site.

CPT Code Information

84295 Chemistry: Sodium, serum, plasma or whole blood

LOINC Code Information

2951-2 Sodium [Moles/Volume] In Serum Or Plasma

Test Method

MercyOne: Ion-Selective Electrode Potentiometry; Beckman DXC880i & iStat 

MA: Ion-Selective Electrode (ISE) Method; Roche Cobas 6000

Reference Values

Sodium: 135-145 meq/L

  • Critical Values:
    • Low: <120 meq/L
    • High: >160 meq/L