Test Overview
Test Methodology

GEM 5000- ion-selective electrode, amperometric electrode, electrical conductivity, and optical absorbance

Test Usage

This test is performed in the hemodialysis unit by point of care operators. Determination of whole blood sodium, potassium, ionized calcium, pH and HCO3 to aid in the diagnosis of a patient's acid/base status, electrolyte and metabolite balance. 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.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Specimens must be free of clots and fibrin strands.

Test Details
Analytic Time

45 seconds

Soft Order Code
MiChart Code
POC Hemodialysis Venous Panel (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.

Normal Volume
3 mL whole blood
Minimum Volume
150 µL whole blood
Rejection Criteria
Specimens; older than 30 minutes, containing bubbles, having prolonged exposure to room air, and/or grossly hemolyzed.
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
pH (82803), CO2(82803), Sodium (84295), Potassium (84132), Ionized calcium (82330), HCO3(82803)
pH (2744-1), CO2(2019-8), Sodium (2947-0), Potassium (6298-4), Ionized calcium (1994-3), HCO3 (1959-6)