maratoolCockcroft-Gault vs CKD-EPI
A side-by-side comparison of Cockcroft-Gault Creatinine Clearance Calculator and CKD-EPI Creatinine Clearance Calculator.
Cockcroft-Gault (1976) estimates creatinine clearance (CrCl) in mL/min and remains the historical reference for drug dose adjustment in renal impairment. CKD-EPI 2021 estimates glomerular filtration rate (eGFR) in mL/min/1.73 m² and is the current KDIGO-recommended equation for CKD staging. The 2021 update removed the race coefficient that previous versions used.
When to use Cockcroft-Gault Creatinine Clearance Calculator
Use Cockcroft-Gault for drug dose adjustments when a medication's prescribing information references CrCl thresholds (most older agents — vancomycin nomograms, DOAC dosing, contrast-induced nephropathy risk, gentamicin dosing). Cockcroft-Gault is still the standard for FDA-mandated drug labeling.
When to use CKD-EPI Creatinine Clearance Calculator
Use CKD-EPI 2021 for CKD staging, mortality risk assessment, and nephrology referrals. It is the equation embedded in current KDIGO guidelines and in eGFR values reported automatically by most labs. CKD-EPI is more accurate in patients with near-normal renal function.
Side-by-side comparison
| Cockcroft-Gault Creatinine Clearance | CKD-EPI Creatinine Clearance | |
|---|---|---|
| Year published | 1976 | 2021 (race-free update) |
| Estimates | Creatinine clearance (mL/min) | eGFR (mL/min/1.73 m²) |
| Inputs | Age, weight, sex, creatinine | Age, sex, creatinine |
| Body surface adjusted | No (uses actual weight) | Yes (per 1.73 m²) |
| Use for drug dosing | FDA / drug label standard | Increasingly accepted but not yet universal |
| Use for CKD staging | Less accurate at higher GFR | KDIGO standard |
| Obesity / muscle mass | Overestimates in obesity | Less affected (no weight input) |
| Reports on lab panels | No | Yes (most labs) |
Bottom line
Use Cockcroft-Gault for drug dosing decisions; use CKD-EPI 2021 for CKD staging and patient communication. They are not interchangeable and can differ by 10–20% in the same patient.
Frequently asked questions
Why did CKD-EPI remove the race coefficient?
In 2021, NKF/ASN concluded that including race as a biological variable was inappropriate and that the race-free equation, calibrated on a more diverse cohort, performs adequately without it. All labs reporting eGFR now use the race-free 2021 equation.
Which equation should I use for vancomycin dosing?
Cockcroft-Gault. Most vancomycin dosing nomograms and Bayesian dosing protocols are calibrated to Cockcroft-Gault CrCl. Using eGFR instead can over- or under-dose by ~10% in patients with extreme body composition.
Can I substitute eGFR for CrCl in drug dose adjustments?
Generally yes for newer drug labels (post-2020), but check the prescribing information — older drugs may explicitly reference CrCl by Cockcroft-Gault. In obese, cachectic, or muscular patients the two values can diverge meaningfully.
Why is MDRD still mentioned?
MDRD (2000) was the prior standard but is less accurate at GFR > 60. It has largely been replaced by CKD-EPI in both clinical practice and laboratory reporting.