Test Overview
Test Methodology

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

Test Usage

Determination of blood gases (pH, pCO2,PO2,SO2,HCO3), sodium, potassium, chloride, ionized calcium, glucose, lactate, hematocrit, and CO-Oximetry to aid in the diagnosis of a patient's acid/base status, electrolyte and metabolite balance, and oxygen delivery capacity.

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
OGLV
MiChart Code
POC GASES/LYTES, Venous
Laboratory
Point of Care
Section
Point of Care
Specimen Requirements
Collection Instructions

Collect in heparinized syringe.

Special Handling

Samples must be tested within 15 minutes of draw time and within 5 minutes if measuring lactate. Expel air bubbles and thoroughly mix syringe samples for >30 seconds by repeatedly inverting and rolling syringe immediately after sample collection. Sample syringe must be capped to seal out air until sample is analyzed in order to maintain accurate pH and blood gas values (pO2, pCO2, O2Hgb).

Rejection Criteria
Specimens; older than 15 minutes, containing bubbles, having prolonged exposure to room air, clotted, 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

Billing
CPT Code
PH (82803), pCO2(82803), pO2(82803), sodium(84295), potassium(84132), chloride(82435), ionized calcium(82330), glucose(82947), lactate(83605), total hemoglobin(85018), HCO3(82803), sO2(82805)
LOINC
PH (2744-1), pCO2(2019-8), pO2(2703-7), sodium(32713-0), potassium(32713-0), chloride(41650-3), ionized calcium(34581-9), glucose(41651-1), lactate(2518-9), total hemoglobin(14775-1), anion gap(73581-1),HCO3(1960-4), sO2(2708-6)
NY State Approved
No