6. Creatinine: Patients: less than or equal to 2.0 mg/dl or creatinine clearance greater than or equal to 30 ml/min/1.73 m^2. Pediatric patients (<18 years old): Creatinine less than or equal to 1.5 mg/dl or a creatinine clearance of greater than or equal to 30 mL/min/1.73 m^2.