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 All adults need a tetanus booster vaccine every 10 years. Tetanus booster is available in combination with diphtheria (Td vaccine) or diphtheria and pertussis (Tdap vaccine).  Adults should get Tdap once and then Td every 10 years after.