CKD-EPI 2021 Cystatin-C eGFR (race-free)
The 2021 race-free CKD-EPI eGFR: cystatin-C alone, the combined creatinine + cystatin C estimate, and creatinine-only for comparison (Inker 2021).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Serum cystatin C
- 1.5 mg/L
- Serum creatinine
- 1.1 mg/dL
- Age
- 70 years
- Sex
- Female
Result: eGFRcys 40.6 mL/min/1.73m²; eGFRcr-cys 47.4 (combined); eGFRcr 54.1 (creatinine-only).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- eGFRcys
- Cystatin-C-only estimate; no race coefficient (Inker 2021).
- eGFRcr-cys
- Combined creatinine + cystatin C; the recommended confirmatory estimate near a decision threshold, shown beside the creatinine-only value.
What you enter
- Serum cystatin C
- Serum creatinine (for the combined estimate)
- Age
- Sex
How this is calculated
Inker LA, Eneanya ND, Coresh J, et al. New creatinine- and cystatin C-based equations to estimate GFR without race. N Engl J Med. 2021;385(19):1737-1749. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.
More in Nephrology and acid-base.