The healthcare provider prescribes hydromorphone 1 mg intravenously (IV) every 3 hours for an older client after hip replacement surgery. The nurse prepares the prescribed dose from an ampule labeled, "Hydromorphone Injection 2 mg/mL." Additional instructions for opiate naive clients recommend diluting the dosage with 3 mL of sterile normal saline (NS) for IV push over 2 to 3 minutes. How many mL is the total volume of diluted medication? (Enter the numerical value only. If rounding is required, round to the nearest tenth.)