Test Overview
Test Methodology

i-Stat - ion-selective electrode potentiometry (Na, K, Cl, BUN), amperometry (creatinine, glucose), conductometry (hematocrit), Hemoglobin (calculated, HCT% X0.34)

Test Usage

Point of Care iSTAT testing is available in certain nursing units and procedure areas and is performed by authorized operators in those areas.

Reference Range *

Reference ranges are available in the iStat CHEM 8+ 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.
•Prolonged tourniquet application (venous stasis) and forearm excercis may decrease pH due to localized production of lactic acid. This in turn can affect ioniazed calcium.
•Results may be affected in the following situations: hemolysis, traumatic draw, pumping fist during draw, extended delay between drawing and testing specimen, exposure to air, and obtaining specimen from an arm with an IV.
•Results outside the reportable ranges for the system will be display with a "<" or ">" symbol.

Test Details
Analytic Time

2 minutes

Soft Order Code
MiChart Code
Basic Metabolic Panel Plus, Point of Care
Point of Care
Point of Care
Specimen Requirements
Collection Instructions

Collect in lithium or sodium heparin syringe/tube.

Special Handling

Samples must be tested within 30 minutes of collection and immediately after exposing the sample to room air.

Normal Volume
3 mL whole blood
Minimum Volume
95 µL whole blood
Rejection Criteria
Specimens; containing clots, collected in anticoagulant other than lithium or sodium heparin, 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
Sodium (84295), Potassium (84132), Chloride (81235), Ionized calcium (82330), Glucose (82947), BUN (84520), Creatinine (82565), Hematocrit (85014)
Sodium (39791-9), Potassium ( 39789-3), Chloride (2069-3), Ionized Calcium (41645-3), Glucose (41652-9), Urea Nitrogen ( 62999-2), Creatinine ( 38483-4), calc. Hemoglobin (20509-6)