Table 1.

Schwartz estimated creatinine clearance equation

Age	K
≤1 year
low birth weight	0.33
full term	0.45
2 to 12 years	0.55
13 to 21 years
female patients	0.55
male patients	0.7

eCCl (ml/min per 1.73 m²) = K × length (cm)/serum creatinine (mg/dl). K, age-specific proportionality constant.