eGFR — CKD-EPI 2021 + Cockcroft-Gault

Age(years)
Used in both CKD-EPI 2021 and Cockcroft-Gault.
Sex
Both equations apply a sex-specific coefficient.
Serum creatinine(mg/dL)
Use today's steady-state value; if SCr is changing > 0.3 mg/dL in 48 h, this is AKI and the equations' steady-state assumption is violated.
Weight(kg)
Required only for Cockcroft-Gault. For obese patients consider IBW or adjusted body weight.
Primary equation
Both compute in parallel either way — this just picks which one shows as the headline.