GFR and wGFR Are Not the Same Thing
GFR (glomerular filtration rate) and wGFR (weighted GFR) are distinct concepts, though the term "wGFR" does not appear in current clinical guidelines or standard nephrology practice. The provided evidence does not reference "wGFR" or "weighted GFR" as a recognized clinical entity 1.
What GFR Actually Means
GFR refers specifically to the rate at which the glomerulus filters plasma to produce an ultrafiltrate—it is the fundamental measure of kidney function 1. Current guidelines emphasize using the term "GFR" only when referring to this specific kidney function of glomerular filtration 1.
Current GFR Assessment Methods
In clinical practice, you will encounter:
- eGFRcr: Creatinine-based estimated GFR (initial test for most patients) 1
- eGFRcys: Cystatin C-based estimated GFR 1
- eGFRcr-cys: Combined creatinine and cystatin C-based estimated GFR (recommended when eGFRcr is less accurate and clinical decisions depend on accurate GFR) 1
- mGFR: Measured GFR using exogenous filtration markers 1
The 2024 KDIGO guidelines specifically recommend using eGFRcr-cys in clinical situations when eGFRcr is less accurate and GFR affects clinical decision-making 1.
Important Clinical Context
The 2022 NKF-ASN Task Force recommended immediate implementation of CKD-EPI equations refit without race variables, creating a unified approach to GFR estimation 2. This represents the current standard of care in the United States.
If you encountered the term "wGFR" in a specific context (such as a research paper or institutional protocol), it likely represents a local or experimental variation not recognized in standard clinical practice. For all clinical decision-making, use the standardized GFR terminology and equations outlined in current KDIGO guidelines 1.