An obsterician sees a pregnant patient who was exposed to rubella virus in the eighteen week of pregnancy. She does not remember getting a rubella vaccination. The best immediate course of action is to
The highest risk of fetal infection with rubella occurs during the first trimester. In seronegative patients, the risk of infection exceeds 90%. However, before other measures (such as termination of pregnancy) are considered, a rubella immune status must be performed. A rubella titer of 1:10 is protective.
Terminate the pregnancy
Order a rubella antibody titer to determine immune status
Reassure the patient because rubella is not a problem until after the thiieth week
Administer rubella vaccine