What is the final step in drawing the vaccine from the vial?

What is the final step in drawing the vaccine from the vial?

• A. Remove the cap
• B. Clean the diaphragm
• C. Pull back the plunger to aspirate the air
• D. Inject the air and aspirate the vaccine

Answer: (D)

Drawing the vaccine from a vial hinges on balancing pressure inside the vial so the liquid can be withdrawn smoothly and accurately. After you’ve prepared the syringe and stopper (wiping the stopper with alcohol and inserting the needle), you typically first pull back to aspirate a small amount of air into the syringe to create space. The final action in the withdrawal sequence is to inject that air into the vial and then aspirate the vaccine. This step equalizes the pressure inside the vial, allowing the vaccine to be drawn up to the correct dose. It also helps minimize the formation of air bubbles in the syringe as you complete the withdrawal.

Drawing the vaccine from a vial hinges on balancing pressure inside the vial so the liquid can be withdrawn smoothly and accurately. After you’ve prepared the syringe and stopper (wiping the stopper with alcohol and inserting the needle), you typically first pull back to aspirate a small amount of air into the syringe to create space. The final action in the withdrawal sequence is to inject that air into the vial and then aspirate the vaccine. This step equalizes the pressure inside the vial, allowing the vaccine to be drawn up to the correct dose. It also helps minimize the formation of air bubbles in the syringe as you complete the withdrawal.