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23129 Glomerular Filtration Rate

Glomerular Filtration Rate
Test Code:
Synonyms/Keywords
GFR​, eGFR
Test Components
The glomerular filtration rate is a calculation -- it may be obtained by ordering a Comprehensive Metabolic Panel, Basic Metabolic Panel, Renal Function Panel, or Creatinine. Calculations are not available as orderable tests.​
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 Tube (PST)​, Serum Separator Tube (SST)
Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT)
 1 mL​ 0.3 mL​ ​
Specimen Stability Information
Specimen Type Temperature Time
Plasma/Serum​ ​ ​ Ambient​ 7 days
Refrigerate​ 7 days​
Frozen​ 1 year​
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
​Chippewa Falls ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Weston
 ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
​Eau Claire ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Park Falls​
 ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Ladysmith​ ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Rice Lake
 ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
​Marshfield​ ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Menomonie Monday through Friday Less than 2 hours​ ​​IDMS Traceable MDRD Study Equation ​
​Minocqua ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
​Stevens Point ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Wisconsin Rapids​ ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
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 >= 60 mL / min / 1.73m² ​
Synonyms/Keywords
GFR​, eGFR
Test Components
The glomerular filtration rate is a calculation -- it may be obtained by ordering a Comprehensive Metabolic Panel, Basic Metabolic Panel, Renal Function Panel, or Creatinine. Calculations are not available as orderable tests.​
Ordering Applications

The glomerular filtration rate is a calculation -- it may be obtained by ordering a Comprehensive Metabolic Panel, Basic Metabolic Panel, Renal Function Panel, or Creatinine.  It is not available as an orderable test.​​​

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 Tube (PST)​, Serum Separator Tube (SST)
Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT)
 1 mL​ 0.3 mL​ ​
Specimen Stability Information
Specimen Type Temperature Time
Plasma/Serum​ ​ ​ Ambient​ 7 days
Refrigerate​ 7 days​
Frozen​ 1 year​
Test Components
The glomerular filtration rate is a calculation -- it may be obtained by ordering a Comprehensive Metabolic Panel, Basic Metabolic Panel, Renal Function Panel, or Creatinine. Calculations are not available as orderable tests.​
Reference Range Information
Performing Location Reference Range
All Performing Sites >= 60 mL / min / 1.73m² ​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
​Chippewa Falls ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Weston
 ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
​Eau Claire ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Park Falls​
 ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Ladysmith​ ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Rice Lake
 ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
​Marshfield​ ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Menomonie Monday through Friday Less than 2 hours​ ​​IDMS Traceable MDRD Study Equation ​
​Minocqua ​Monday through Sunday​ ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
​Stevens Point ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
Wisconsin Rapids​ ​Monday through Friday ​Less than 2 hours​ ​IDMS Traceable MDRD Study Equation ​
For billing questions, see Contacts
For most current information refer to the Marshfield Laboratory online reference manual.