How does the doctor know only by blood work that I didn't obtain the Rubella vacination?

When the doctor did blood work on me while I was pregnant he mentioned that I didn't get the Rubella Vaccination, how would he know that just by blood work? I newly had my third baby, and we are not having anymore children, Should I still draw from the vaccination?
Answers:
Part of the routine blood panel in early pregnancy is a titer for rubella immunoglobulins. It's across the world assumed (without exactly overwhelming evidence) that a titer of less than 1:8 does not confer immunity. Whether you simply didn't have the vaccine, or whether you have it and it didn't confer an adequate or lasting response, was a short time ago a guess on his part. Now that you've completed your family, rubella immunization (it's as a rule done along with mumps and rubeola in one shot) isn't so important any more, but you don't want rubeola or mumps as an fully fledged, so it isn't a bad idea. There are sporadic cases that crop up, especially in but not predetermined to states that have a high number of people from other countries where on earth the immunizations aren't routine.
just by knowing the immunoglobulin titre (IgG &IgM) ,whether you are vaccinated against rubella is confirmed. Source(s): my experience

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