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Test Code LAB8213 Estimated Glomerular Filtration Rate (eGFR)

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Calculation using CKD-EPI 2021 study equation:

GFR = 142 min (standardized Scr/K, 1)α x max (standardized Scr/K, 1) -1.200 x 0.9938 Age x 1.012 [if female]

The equation requires three variables:

  • Serum, or plasma, creatinine (Scr)
  • Age in years (18 years or older)
  • Gender (male or female)
  • Race is not included when using the BJC Cerner eGFR calculation.
    • Note: The laboratory’s creatinine method has been calibrated to be traceable to an isotope dilution mass spectrometry (IDMS).

Literature Reference:

A Unifying Approach to GFR Estimation: Recommendations of the NKF-ASK Task Force on Reassessing the Inclusion of Race in Diagnosing Kidney Disease, JASN 2021. 

Specimen Requirements

Reflex ordered concurrently with LAB66 Creatinine, Plasma, LAB15 Basic Metabolic Panel (BMP), LAB17 Comprehensive Metabolic Panel (CMP), and LAB19 Renal Function Panel.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory

Test Classification and CPT Coding

Not applicable

Reference Values

≥ 60 mL/min/1.73m2     

Additional Information

For BJH Laboratory Use Only
Laboratory Processing Instructions:
Test performed in BJH Core Lab.  eGFR  must have accompanying creatinine. Processed by 8100 automated line in Core Lab for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days.

Test performed in South County Siteman and Ambulatory Cancer Building Lab.  eGFR  must have accompanying creatinine.  Centrifuge sample and deliver to the Cobas.  Completed specimens are stored refrigerated for 5 days. 

LOINC Code Information

Name LOINC Code
Glomerular filtration rate predicted 98979-8