Estimate creatinine clearance from a serum creatinine, the patient's height, and a proportionality constant using the Schwartz method.

CrCl = (k * Ht) / Cr

This formula tends to overestimate the actual creatinine clearance and should be used with caution. Many medications must be adjusted for renal impairment when the CrCl falls below 50 mL/min.

1. Schwartz GJ, Gauthier B. J Pediatr 1985 Mar;106(3):522-6
2. Schwartz GJ, Feld LG, Langford DJ. J Pediatr 1984 Jun;104(6):849-54