Understanding Lab Tests for Rubella Infection
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Rubella, also known as German measles, is a contagious viral infection that can cause serious complications, especially during pregnancy. Blood tests are the primary method for diagnosing rubella infection and determining immune status by detecting specific antibodies the body produces in response to the virus.
Recommended Test
Rubella Immune Status
This blood test measures Rubella IgG antibodies to determine immune status. High levels of Rubella IgG antibodies indicate previous infection with the rubella virus or successful vaccination, showing that the person has developed immunity. The presence of these antibodies in the bloodstream is a clear indicator of past or recent rubella exposure, as the immune system produces these specific antibodies to fight off the rubella virus.
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Diagnosing Rubella Infection and Immunity
Because rubella symptoms can be mild or similar to other viral infections, blood testing is essential for accurate diagnosis. The test measures rubella antibodies (IgG) which indicate whether someone has been infected in the past, recently infected, or is immune due to vaccination.
Understanding Your Results
Positive IgG antibody results typically indicate immunity to rubella, either from past infection or vaccination. This testing is particularly important for women of childbearing age, as rubella infection during pregnancy can cause serious birth defects. Healthcare providers may also order additional tests to distinguish between recent and past infections.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
