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Updated: Oct 5, 2025
A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
Published on: May 10, 2013
[Use cystatin C-based GFR-estimating equations]
Anders Grubb1, Anders Christensson2, Mårten Segelmark3
1professor, institutionen för laboratoriemedicin, Skånes universitetssjukhus, Lund.
Insights
Glomerular filtration rate (GFR) estimation using cystatin C is recommended over creatinine-based equations. Cystatin C equations avoid using "race" terms, which are sociological, not biological, and impact creatinine levels due to muscle mass differences.
Area of Science:
- Nephrology
- Clinical Chemistry
- Biomarkers
Background:
- Glomerular filtration rate (GFR) is a key indicator of kidney function.
- Current GFR estimation relies on creatinine-based or cystatin C-based equations.
- Creatinine-based equations incorporate "race" adjustments due to population differences in muscle mass.
Purpose of the Study:
- To highlight the limitations of race-based adjustments in GFR estimation.
- To advocate for the adoption of cystatin C-based GFR-estimating equations.
- To emphasize the sociological nature of "race" versus biological markers.
Main Methods:
- Review of international studies and guidelines on GFR estimation.
- Analysis of factors influencing creatinine and cystatin C levels.
- Comparison of race-adjusted creatinine equations with cystatin C equations.
Main Results:
- "Race" is a sociological construct, not a biological determinant of GFR.
- Average muscle mass variations between populations affect creatinine levels.
- Cystatin C levels are not influenced by muscle mass, making it a more universal marker.
Conclusions:
- International studies strongly recommend cystatin C-based GFR-estimating equations.
- Eliminating "race" terms improves the accuracy and equity of GFR estimation.
- Transitioning to cystatin C offers a more precise and biologically sound approach to assessing kidney function.
Abstract:
Glomerular filtration rate (GFR) is estimated by creatinine or cystatin C-based GFR-estimating equations. Those based upon creatinine, but not those based upon cystatin C, use "race" terms due to that different populations differ in average muscular mass, influencing the creatinine, but not the cystatin C, level. "Race" is not a biological, but a sociological term, determined by self-assesment. New international studies therefore strongly recommend use of cystatin C-based GFR-estimating equations.
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