- Renal: serum creatinine < 2.0 mg/dl (adults) or glomerular filtration rate (GFR) >40 mL/min/1.73m2 (peds). Patients with a creatinine > 1.2 mg/dl or a history of renal dysfunction must have glomerular filtration rate (GFR) > 40 mL/min/1.73m2.