An MMR Titer is a blood test that checks your antibody titer levels to Measles, Mumps and Rubella. It is run in a laboratory. A titer test is not an injection, shot, or vaccination. An antibody is a component of the immune system.
If you're an adult, get a Td (tetanus and diphtheria) booster shot every 10 years to stay protected. Since some people may lose the protective antibody levels after 5 years, a booster vaccination is recommended if you get a deep, contaminated wound and haven't had a vaccination in more than 5 years.
Over time, protection from tetanus decreases, so older children need to get a booster shot. It has a full dose of tetanus and lower amounts of diphtheria and pertussis. All people between the ages of 11 and 18 are advised to get the booster, preferably around 11 or 12 years old.