What happens if I don’t complete the full course of vaccine injections, do I need to start again from the beginning? No, you should continue from your last dose. You can have a blood test four weeks after the last dose of the vaccine to make sure you are immune. Find out more about hepatitis B vaccinations References Hepatitis B Foundation. (n.d.). Vaccination. Retrieved from Hepatitis B Foundation. Updated 2 December 2019 Manage Cookie Preferences