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.
Kids might worry about needing a shot every time they go to the doctor, but the truth is that kids don't need many shots after they're old enough to go to school. You will need a tetanus booster, usually when you are about 12 years old, or sometimes sooner if you get a deep or dirty wound.