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.
Teens who missed getting a tetanus and diphtheria toxiods booster vaccine (Td) or Tdap booster at age 11-12 should also receive a single dose of Tdap if they have completed the recommended childhood DTaP vaccination series. Td boosters are recommended every 10 years throughout adulthood.