Rubella Virus - IgM

Two types of rubella antibodies can be detected by lab tests which include IgM and IgG. IgM antibody is the first one to appear in response to initial exposure to the rubella virus. It rises to peak in the blood within about 7 to 10 days after infection and then drops down after a few weeks. However, in case of newborns this antibody can be detected for a longer period of time. Once IgM is in the blood the second IgG rubella antibody starts to appear. This antibody stays for life and provides protection against re-infection. If IgG antibodies are detected in the blood, it indicates a recent or past rubella infection. Also, it is indicative that the person has received rubella vaccine.

The healthcare provider takes a blood sample from the arm. The site from where the blood is to be withdrawn is cleaned with a swab of rubbing alcohol. This is then followed by inserting a small needle which has a tube attached to it for collecting blood. Once the sufficient blood for analysis is withdrawn, the needle is removed. The site is then covered with a gauze pad.

As such there is no risk but in few cases, bruising, bleeding, and infection at the puncture site can be seen. In very few cases, there can be swelling of the vein after the blood is withdrawn.