The only way to be absolutely certain about what vaccinations you've received is to gather your medical records—from childhood, from high school, and from adulthood. Contact your current and former doctors and request your immunization records; your current doctor can help you determine whether or not you're up to date.
If you can't remember all of your past doctors, however, or if your records are unavailable for some reason, there are still a few steps you can take to determine your vaccination status.
Testing for Immunity
For certain vaccinations, your doctor can perform a test for evidence of immunity, whether from a prior vaccination or an infection. In the case of varicella (chickenpox), for example, a blood test can show whether or not you're immune to the disease. Alternatively, if a health care provider can verify that you had previously been diagnosed with chickenpox, you don't need to worry about receiving the chickenpox vaccine: that prior infection will provide immunity.
Generally, adults born before 1957 are considered immune to measles and mumps. The CDC advises most adults born in 1957 or afterward get an MMR vaccine. If you are not sure if you were immunized, a simple blood test could confirm immunity, whether you had the measles as a child or you were vaccinated.
If you are not immune, as an adult, you could get two doses of MMR vaccine, separated by 28 days.
If you have special health concerns, talk to your doctor at your next wellness visit. If you are an international traveler or work in health care, your chances of coming into contact with virus' is greatly increased.
Where can I get the vaccine?
Most family and pediatric doctors keep vaccine in their clinics; and local health departments usually have vaccine. If someone isn't sure where to get vaccine, they can call the local or state health department.