Test Overview
Test Methodology

Abbott I-Stat CG8+ cartridge- potentiometry (Na, K, ionized calcium, pH, pCO2)
amperometrical measurement (glucose, pO2), conductometry (HCT), calculated (hemoglobin, HCO3)

Test Usage

Performed at authorized locations by point of care operators. Includes: Sodium, Potassium, Ionized Calcium, Glucose, Hematocrit, Hemoglobin, pH, pCO2, pO2, HCO3.
Sodium- monitoring electrolyte imbalances.

Potassium- monitoring and aiding in the diagnosis of diseases and
clinical conditions that manifest high and low potassium levels.

Chloride- used in the diagnosis, monitoring, and treatment of electrolyte and metabolic disorders (e.g., cystic fibrosis, diabetic acidosis, and hydration disorders.

Ionized Calcium- aids in the diagnosis and treatment of parathyroid disease, bone disease, chronic renal disease and tetany.

Glucose- used in the diagnosis, monitoring and treatment of carbohydrate metabolism disorders.

Hematocrit- aid in the determination and monitoring of normal or abnormal total red cell volume status that can be associated with conditions including anemia and erythrocytosis.

pH, pO2, pCO2- measurements are used in the diagnosis monitoring, and treatment of respiratory disturbances and metabolic and respiratory-based acid-base disturbances.

HCO3- bicarbonate is used in the diagnosis and treatment of numerous potentially serious disorders associated with changes in body acid base balance.

Reference Range *

Reference ranges are available in the I-Stat (CG8+)- Blood Gas/ Electrolytes Glucose/ iCal 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

•Prolonged tourniquet application and forearm exercise may decrease pH due to localized production of lactic acid.
•Exposure of sample to air will cause an increase in pH, a decrease in pCO2 and increase in pO2.
•Results may be affected in the following situations: hemolysis, traumatic draw, pumping fist during draw, extended delay between drawing and testing thee specimen

Test Details
Analytic Time

2 minutes

Soft Order Code
MiChart Code
POC Survival Flight Panel
Point of Care
Point of Care
Specimen Requirements
Collection Instructions

Collect in lithium heparin syringe/tube.

Special Handling

Perform testing on sample collected without anti-coagulant immediately (within 3 minutes of collection). Test samples collected in anticoagulant within 10 minutes of collection. Immediately after collection, mix blood and anticoagulant to prevent clotting by inverting a tube gently at least 10 times, or roll a syringe between the palms for at least 5 seconds each in two different directions and then invert repeatedly for at least 5seconds. Discard the first two drops of blood from a syringe and check for clots.

Normal Volume
3 mL whole blood
Minimum Volume
95 µL whole blood
Rejection Criteria
•Clotted samples.
•Samples in anticoagulant tubes other than lithium or sodium heparin.
•Air bubbles in sample.
•Specimens older than 30 minutes
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, pCO2, pO2, HCO3 (82803) sodium (84295) potassium (84132) ionized calcium (82947) glucose (82947) hematocrit (85014) hemoglobin (85018)
pH (2746-6), pCO2 (2021-4),pO2 (2705-2), HCO3 (14627-4), sodium (39791-9), potassium (39789-3), ionized calcium (41645-3), glucose (41652-9), hematocrit (41654-5), hemoglobin (20509-6)