A nurse is preparing to administer morphine 0.1 mg/kg IV bolus every 3 to 4 hr PRN for pain to a school-age child who weighs 51 lb. Available is morphine injection 2 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Calculation: Convert the child's weight from pounds (lb) to kilograms (kg) using the conversion factor of 2.2 lb/kg. Patient's weight in kg = 51 lb / 2.2 lb/kg = 23.1818 kg. Calculate the dose in milligrams (mg) for the child. Dose (mg) = Ordered dose (mg/kg) × Patient's weight (kg) = 0.1 mg/kg × 23.1818 kg = 2.31818 mg. Available concentration = 2 mg/mL. Calculate the volume in milliliters (mL) to administer per dose. Volume (mL) = Dose (mg) / Available concentration (mg/mL) = 2.31818 mg / 2 mg/mL = 1.15909 mL. Round the answer to the nearest tenth. = 1.2 mL.