Lab Test

Sodium and Potassium, Whole Blood

Test Codes





Sodium and Potassium, Whole Blood should ONLY be collected at the Dearborn, Grosse Pointe, Royal Oak, Taylor, Trenton, Troy, or Wayne Hospital Campuses. Specimens should not be collected at any other Beaumont Laboratory drawsite, nursing home, or Outreach office. 

Specimen Collection Criteria

Collect: One Dark Green-top Lithium Heparin tube. (Minimum Whole Blood: 1.0 mL)

Transport specimen STAT to the Laboratory after collection.

Rejection Criteria

Specimen in which significant delays occur before arrival in the Laboratory (greater than 2 hours).

Inpatient Specimen Preparation

Transport the specimen STAT to the STAT Laboratory (Royal Oak) or Chemistry Laboratory (Troy).

In-Lab Processing

Immediately analyze the whole blood specimen upon receipt in the Laboratory.


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): Unacceptable

Specimen Storage in Department Prior to Disposal:

Refrigerated (2-8°C or 36-46°F): 7 days


Dearborn Chemistry Laboratory
Grosse Pointe Chemistry Laboratory
Royal Oak STAT Laboratory
Taylor Chemistry Laboratory
Trenton Chemistry Laboratory
Troy Chemistry Laboratory
Wayne Chemistry Laboratory 


Sunday – Saturday, 24 hours a day.
Results available within 30 minutes of receipt in the Laboratory.

Reference Range

Adult range
: 135-145 mmol/L.

Age related reference range:

Age Range (mmol/L)
0 - 1 day 126-166
2 - 29 days 134-144
30 days - 1 year 139-146
Greater than 1 year - 12 years 138-145
13 years - adult 135-145

Adult range: 3.5-5.2 mmol/L.

Age related reference range:

Age Range (mmol/L)
0 - 1 day 5.0-7.5
2 days - 3 months 4.0-6.2
4 months - adult 3.5-5.2

Test Methodology



See Sodium and Potassium assays.

Clinical Utility

This assay is appropriate when rapid turnaround time is important for patient management.

CPT Codes

84132, 84295.
LOINC:  Potassium 2823-3, Potassium Whole Blood 6298-4


Last Updated


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