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22483 Creatinine

Creatinine
Test Code: CREAT
Synonyms/Keywords
​​ Creatinine, GFR
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.​
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
Performing Laboratory 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 
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 × min(Scr/κ, 1)a × max(Scr/κ, 1)−1.200 × 0.9938Age × 1.012 [if female]

where κ = 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.​​ ​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82565 ​ ​ ​​1
 ​ ​
Synonyms/Keywords
​​ Creatinine, GFR
Ordering Applications

Ordering Application Description
​Cerner
 ​Creatinine Level

If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
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

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
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.​
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.​​ ​
For more information visit:
Performing Laboratory 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 
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82565 ​ ​ ​​1
 ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.