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About the test
What is this test done for?
Rubella IgM is a blood test used for detecting antibodies against rubella virus, which is responsible for rubella or German measles.
Why is it Done?
This is a specialized blood test done for diagnosing a disease called as rubella. Presence of rubella IgM in the blood indicates recent infection of rubella virus and it is the most probable cause for ongoing eruptions and fever.
When should it be performed?

This test is performed

  • If a patient has symptoms of rubella
    • Fever
    • A pink rash on the body
      • It begins over face
      • Spreads downwards to abdomen, arms and legs
      • Once rash starts spreading over the body, it starts disappearing from face
    • Running nose or stuffy nose
    • Soreness of eyes
    • Pain in joints
    • Swollen lymph nodes
  • If a pregnant woman has symptoms of rubella or any infection that causes eruptions and fever; because rubella is known to produce birth defects in new born, like deafness, heart defects, cataracts  etc
How is it done
A blood sample will be collected from a vein in your arm. No special preparations like fasting required.

The test result is normal or negative; if the report reads rubella IgM antibodies are absent. It means

  • Absence of rubella infection

The test result is positive; if report reads rubella IgM antibodies are present. It means

  • Rubella infection

Rubella IgM antibodies take some time to appear after infection, thus the test may be repeated after 5 days to confirm diagnosis.

Other Tests
  • Rubella IgG
    • It is a specialized blood test carried out to detect another set of antibodies i.e. IgG levels in the blood
    • Positive test means past infection of rubella virus or vaccination against rubella virus
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