Test Overview
Test Methodology

Abbott I-Stat - ion selective potentiometry

Test Usage

Performed at authorized locations by point of care operators. Includes pH, pCO2, pO2, and HCO3. Abnormal arterial pH and blood gases are used to determine ventilator parameters and to assess the effectiveness of drug therapies including the administration of supplemental oxygen.

Reference Range *

Analyte specific reference ranges are available in the i-Stat 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 the specimen.

Test Details
Days Set Up
This test is available at Brighton Center for Specialty Care drawsite and West Ann Arbor Health Center draw site during normal business hours.
Analytic Time

2 minutes

Soft Order Code
PGASA
MiChart Code
POC Arterial BG, I-Stat (Drawstation)
Laboratory
Point of Care
Section
Point of Care
Specimen Requirements
Collection Instructions

Collect in heparin syringe/tube.

Special Handling

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

Rejection Criteria
Specimens; older than 30 minutes, containing bubbles, having prolonged exposure to room air, and/or grossly hemolyzed.
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.

Billing
CPT Code
82803
LOINC
24336-0
NY State Approved
No