Test Overview
Test Methodology

GEM 5000- ion-selective electrode

Test Usage

The test is performed in the hemodialysis unit by point of care operators. Potassium measurements are used to monitor electrolyte balance in the diagnosis and treatment of disease conditions characterized by low or high blood potassium levels. During the hemodialysis procedure, serum potassium levels are monitored to reduce the risk of cardiovascular events.

Reference Range *

Analyte specific reference ranges are available in the Gem 5000 test procedure located on the POC website: https://www.pathology.med.umich.edu/point-of-care.

Test Limitations

Specimens must be free of clots and fibrin strands.
Hemolyzed specimens will give falsely high potassium results.

Test Details
Analytic Time

45 seconds

Soft Order Code
MiChart Code
POC Hemodialysis Potassium (Results for Dialysis use only)
Point of Care
Point of Care
Specimen Requirements
Collection Instructions

Collect in heparinized syringe.

Special Handling

Samples must be tested within 15 minutes of draw time. Sample must be tested immediately after exposing the sample to room air.

Rejection Criteria
Specimens; older than 30 minutes, containing bubbles, having prolonged exposure to room air, and/or grossly hemolyzed.
Normal Volume
3 mL whole blood
Minimum Volume
150 µL whole blood
Additional Information

For more test specific information, please refer to the test procedure found on the Michigan Medicine POC website: https://www.pathology.med.umich.edu/point-of-care

CPT Code
NY State Approved