The nurse is preparing a dose of ketorolac 12 mg intravenously using a 1 mL vial containing 30 mg/mL. How many mL should the nurse administer? (Enter numerical value only.)

Calculation: Desired dose = 12 mg. Available concentration = 30 mg/mL. Calculate the volume to administer. Volume to administer (mL) = Desired dose (mg) / Available concentration (mg/mL) = 12 mg / 30 mg/mL = 0.4 mL.