GFR Decline Rate (%/year) Calculator

GFR Decline Rate (%/year): Explanation and Clinical Context
The GFR Decline Rate quantifies the annualized percentage change in estimated glomerular filtration rate (eGFR) over time.
It is calculated as: ((Follow-up eGFR – Baseline eGFR) / Baseline eGFR) / Time interval in years × 100.
This metric is crucial for identifying patients at risk of progressive chronic kidney disease (CKD).
A decline rate >5% per year is typically considered rapid and may indicate high-risk CKD progression, warranting closer monitoring and early intervention.
Rates between 1–5% per year indicate moderate decline, while < 1% per year is generally considered stable.
The GFR decline rate helps guide therapeutic decisions, predict long-term renal outcomes, and stratify patients for clinical trials.

Reference:
Levey AS, Inker LA, Coresh J. "Chronic Kidney Disease." Lancet. 2019;393:1236-1250. doi:10.1016/S0140-6736(18)32279-2
KDIGO 2021 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int. 2021;100:S1-S150.