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.
1 For adults, a tetanus booster every 10 years ensures protection against tetanus; the new Tdap booster provides protection not only against tetanus, but also against diphtheria and pertussis.  Because of the rise in US pertussis cases, some people should not wait 10 years to get their Tdap booster.