Test Overview
Test Methodology

i-stat- amperometry

Test Usage

iSTAT whole blood Creatinine testing is performed in authorized units by point of care operators.
Creatinine measurements are used in the diagnosis and treatment of renal diseases, in monitoring renal dialysis, and as a calculation basis for measuring other urine analytes. Creatinine analysis may be used to evaluate kidney function prior to certain procedures.

Reference Range *

Analyte specific reference ranges are available in the i-Stat creatinine 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

•Creatinine may be elevated in patients using creatine supplements, experiencing muscle trauma or other primary or secondary myopathies, taking statins for hyperlipidemia control, or in patients with hyperthyroidism or a rare genetic defect of the creatine transporter protein.

•Results may be affected in the following situations: hemolysis, traumatic draw, pumping fist during, extended delay between drawing and testing specimen, and obtaining specimen from an arm with an IV.

Test Details
Analytic Time

2 minutes

Soft Order Code
MiChart Code
Creatinine, Point of Care
Point of Care
Point of Care
Specimen Requirements
Collection Instructions

Collect in lithium or sodium heparin syringe/tube.

Special Handling

•Samples collected in Lithium Heparin tube must be tested within 30 minutes of collection.
•Samples collected in a syringe without anticoagulant must be tested within 3 minutes.
•Test samples collected in anticoagulant that are not tested with in 10 minutes, it is recommended that the sample be remixed and the first two drops of blood be discarded.

Normal Volume
3 mL whole blood
Minimum Volume
65 µL whole blood
Rejection Criteria
Specimens; containing clots, collected in anticoagulant other than lithium heparin, older than 30 minutes.
CPT Code