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.
Any object that has dirt, soil, spit or feces on it is dirty and will require either a tetanus shot or booster unless you have recently had one. Re-vaccinating may be necessary if you have an injury and are not sure when your last tetanus booster was. The doctor will ask if you had a booster within the last 5 years, and if not, he will want to give another booster as a precaution.