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Beaumont Laboratory

Sodium and Potassium

Na/K (Sodium and Potassium), Antrim #17101, EPIC: LAB5114, SOFT: NAK

Instructions

Note: Blood should be obtained with as little venous stasis (i.e. tourniquet time) as possible. Fist clenching may result in false elevation of potassium.

Specimen Collection Criteria

Collect: One Gold-top SST tube. (Minimum Whole Blood: 4.0 mL)

Contact Laboratory for acceptability of other tube types.
See Minimum Pediatric Specimen Requirements for Microtainer® collection.

Caution: Never refrigerate collection tube prior to centrifugation. This may cause a falsely elevated potassium. 

Physician Office/Drawsite Specimen Preparation

Let SST specimens clot 30-60 minutes then immediately centrifuge to separate serum from cells. Refrigerate (2-8°C or 36-46°F) the centrifuged SST tube within two hours of collection. (Min: 0.5 mL)

Preparation for Courier Transport

Transport: Centrifuged SST tube, refrigerated (2-8°C or 36-46°F). (Min: 0.5 mL)

Rejection Criteria

  • Moderate to grossly hemolyzed specimens.
  • Inadequately centrifuged Microtainers® or Gold-top tubes.
  • Red-top tubes with serum not separated from cells within two hours of collection.

Storage

Specimen Stability for Testing:

Centrifuged SST Tubes and Microtainers® with Separator Gel
Room Temperature (20-26°C or 68-78.8°F): 2-4 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): Unacceptable

Red-top Tubes and Microtainers® without Separator Gel
Room Temperature (20-26°C or 68-78.8°F): 2-4 hours
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): Unacceptable

Serum Specimens (Pour-Overs)
Room Temperature (20-26°C or 68-78.8°F): 2-4 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 7 days

Specimen Storage in Department Prior to Disposal:

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

Laboratory

Farmington Hills Chemistry Laboratory.
Grosse Pointe Chemistry Laboratory.
Royal Oak Automated Chemistry Laboratory.
Troy Chemistry Laboratory.

Performed

Sunday - Saturday, 24 hours a day.
STAT results available within 1 hour of receipt in the Laboratory.
Routine results available within 4 hours.

Reference Range

See individual Sodium and Potassium assays for reference ranges.

Test Methodology

Potentiometric.

Interpretation

See individual Sodium and Potassium assays for interpretation.

Clinical Utility

See individual Sodium and Potassium assays for clinical utility.

CPT Code

84295, 84132.

Test Codes

Antrim #17101, EPIC: LAB5114, SOFT: NAK

Last Updated

11/29/2017

Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.

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