When is cystatin C superior to creatinine for GFR estimation?

Cystatin C is superior in patients with extremes of muscle mass (amputees, athletes, sarcopenia), liver disease, and early CKD where creatinine may overestimate GFR. The combined CKD-EPI 2021 equation provides best accuracy.

What factors affect cystatin C independently of GFR?

Cystatin C is elevated by high-dose steroids, thyroid dysfunction, inflammation, and obesity. It may underestimate GFR in patients on high-dose corticosteroids.

Does using cystatin C change CKD staging?

Yes. Up to 30% of patients classified as CKD G3a by creatinine alone may be reclassified when cystatin C is added. 2021 KDIGO guidelines recommend confirmatory cystatin C testing in CKD G3a.

Cystatin C GFR vs Creatinine Precision

Compare cystatin C-based eGFR with creatinine-based eGFR and combined CKD-EPI creatinine-cystatin C equation for improved GFR estimation accuracy.

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Cystatin C GFR vs Creatinine Precision

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Frequently Asked Questions

When is cystatin C superior to creatinine for GFR estimation?

What factors affect cystatin C independently of GFR?

Does using cystatin C change CKD staging?