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HelpTest Code CREAT Creatinine
Useful For
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.
Synonyms/Keywords
Creatinine, GFR
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
| No | Plasma/Serum | Lithium-heparin Plasma Separator (PST), Serum Separator Tube (SST) | Lithium or Sodium-heparin Green Top (GTT), Red Top Tube(RTT) | 1 mL | 0.3 mL | 0.5 mL whole blood |
Collection/Processing Instructions
Samples collected in a GTT or RTT must be removed from cells within one hour for storage or transport. Samples collected in gel barrier tubes must be removed from the primary tube prior to transporting to Marshfield. Do not send the primary collection tube.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma/Serum | Ambient | 7 days |
| Refrigerate | 7 days | |
| Frozen | 2 months |
Test Information
Estimated glomerular filtration rate in mL/min/1.73m2 is based on age, gender, and creatinine in adult patients 18 years and older. Formula does not include a race coefficient.
Formula used is the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI 2021) equation for Adults, recommended by the National Kidney Foundation and the American Society of Nephrology Task Force on Reassessing the Inclusion of Race in Diagnosing Kidney Disease.
eGFRcr= 142 x min(Scr/k, 1)a x max(Scr/k, 1)-1.200 x 0.9938Age x 1.012 [if female]
where:
k = 0.7 (females) or 0.9 (males)
a = -0.241 (female) or -0.302 (male)
Scr = serum creatinine in mg/dL
Age (years)
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| All Performing Sites other than i-Stat testing | 0 - 3 yrs.: 0.3 - 0.6 mg/dL 4 - 13 yrs.: 0.4 - 0.8 mg/dL Male ≥14 yrs.: 0.6 - 1.2 mg/dL Female ≥14 yrs.: 0.4 - 1.0 mg/dL Calculated GFR (eGFR): ≥ 60 mL / min / 1.73m2 |
| See Critical Value Policy for list of current critical values. | |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Beaver Dam | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Chippewa Falls | Monday through Friday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Weston | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Eau Claire | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Park Falls | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Ladysmith | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Rice Lake | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Marshfield | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Minocqua | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Neillsville | Monday through Sunday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Stevens Point | Monday through Friday | Less than 2 hours | Modified Jaffe Kinetic Fixed Assay/Beckman Coulter AU |
| Wisconsin Rapids | Monday through Friday | Less than 2 hours | Modified Jaffe Reaction/Siemens Dimension |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82565 | 1 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82565 | 1 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Creatinine Level |