MDRD GFR Calculator

MDRD GFR Calculator for Nephrology. Continuous numerical GFR bands include G3a at 45 to below 60 and G3b at 30 to below 45. A category does not establish CKD chronicity or indicate dialysis.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

The historical standardized MDRD equation is 175 x creatinine(mg/dL)^-1.154 x age^-0.203, with factor 0.742 for the female coefficient. An explicitly labeled research comparison can add the obsolete 1.212 term; it is not assigned automatically by race.

When to use this calculator

Reproducing the old 175-coefficient model for education or research comparison, not replacing a modern race-free laboratory equation.

Inputs used

  • Serum creatinine (umol/L; US mg/dL)
  • Age (years)
  • Sex coefficient in the source model
  • Historical coefficient reproduction

Clinical interpretation

Continuous numerical GFR bands include G3a at 45 to below 60 and G3b at 30 to below 45. A category does not establish CKD chronicity or indicate dialysis.

Worked example

Age 60, creatinine 1.4 mg/dL and female coefficient without the historical multiplier give 38.36 mL/min/1.73 m2. The optional 1.212 comparison gives 46.49. These historical estimates are not a contemporary care recommendation.

Limitations and safety notes

The old 186-coefficient version is different. Creatinine instability, assay methods and non-GFR determinants limit accuracy. Historical source tables corroborate coefficients; linked correction metadata was checked, but full correction texts were not all available. No clinical or licensing signoff is claimed.

Frequently asked questions

Is the old 1.212 coefficient recommended for patient care?

No. It is an explicitly historical comparison option. Use the appropriate race-free method for current clinical assessment.

What does this result leave unresolved?

The old 186-coefficient version is different. Creatinine instability, assay methods and non-GFR determinants limit accuracy. Historical source tables corroborate coefficients; linked correction metadata was checked, but full correction texts were not all available. No clinical or licensing signoff is claimed.

References

  • https://pubmed.ncbi.nlm.nih.gov/16908915/
  • https://kdigo.org/wp-content/uploads/2017/02/KDIGO_2012_CKD_GL.pdf
  • https://pubmed.ncbi.nlm.nih.gov/33872525/
  • https://kdigo.org/wp-content/uploads/2024/03/KDIGO-2024-CKD-Guideline.pdf

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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