A nurse is preparing to administer vancomycin 20 mg/kg by intermittent IV bolus every 8 hr to a child who weighs 64 lb. The amount available is vancomycin injection 50 mg/mL. How many mL of vancomycin should the child receive per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Convert the child's weight from pounds (lb) to kilograms (kg) using the conversion factor of 2.2 lb/kg. = 11.6 mL. Volume (mL) = Dose (mg) / Available concentration (mg/mL) = 581.818 mg / 50 mg/mL = 11.6363 mL. Round the answer to the nearest tenth. Dose (mg) = Ordered dose (mg/kg) × Patient's weight (kg) = 20 mg/kg × 29.0909 kg = 581.818 mg. Available concentration = 50 mg/mL. Calculate the volume in milliliters (mL) to administer per dose. Patient's weight in kg = 64 lb / 2.2 lb/kg = 29.0909 kg. Calculate the dose in milligrams (mg) for the child.