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

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.

Rejection Criteria
•Clotted samples.
•Samples in anticoagulant tubes other than lithium or sodium heparin.
•Air bubbles in sample.
•Specimens older than 30 minutes
Normal Volume
3 mL whole blood
Minimum Volume
95 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
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)
NY State Approved