Lab Test

Sodium and Potassium, Whole Blood

EPIC: LAB5365, SOFT: NAKW

Instructions

Sodium and Potassium, Whole Blood should ONLY be collected at the Royal Oak or Troy 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.

Storage

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

Laboratory

Royal Oak STAT Laboratory
Troy Chemistry Laboratory

Performed

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

Reference Range

Sodium
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


Potassium
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

Potentiometric.

Interpretation

See Sodium and Potassium assays.

Clinical Utility

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

CPT Codes

84132, 84295.

Contacts

Last Updated

5/5/2020

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This directory currently reflects information only for specimens collected and/or processed at the
Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.