GFR Calculator (Kidney Function)

GFR Calculator (Kidney Function)

Calculate eGFR for CKD staging and renal function assessment (CKD-EPI & MDRD)

Glomerular Filtration Rate (GFR)

eGFR estimates kidney filtration capacity (ml/min/1.73m²). Critical for CKD staging, drug dosing (antibiotics, chemotherapy), contrast safety. Uses CKD-EPI (most accurate) and MDRD formulas with age, gender, creatinine, and race adjustments.

Clinical GFR Formulas

  1. Enter serum creatinine, age, gender, and ethnicity.
  2. CKD-EPI (new standard) vs MDRD (traditional).
  3. Get CKD stage + medication safety guidelines.



FAQs

CKD-EPI vs MDRD accuracy?
CKD-EPI ±5% vs MDRD ±8%. CKD-EPI better for GFR >60 and non-Black patients.
Why creatinine-based only?
Creatinine most standardized. Cystatin C (±3%) alternative but 3x costlier.
Fasting affect creatinine?
No – creatinine stable. Muscle mass dominant factor (bodybuilders 1.5-2.0 mg/dL normal).
Black adjustment controversy?
CKD-EPI 2021 removed race (more equitable). MDRD retains for clinical validation.
When to worry about GFR drop?
>25% acute drop = AKI. >5 ml/min/yr chronic decline = progression.
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