Rubella IgG Immunity Test

Authored By: Dr. Jana Lim
Last updated: Jul 3, 2025

A Rubella IgG immunity test is a serological blood test that measures the presence of immunoglobulin G (IgG) antibodies specific to the rubella virus, indicating past exposure or immunity through immunisation with the MMR (measles, mumps, rubella) vaccine.

This test is commonly used to assess whether an individual is protected against rubella, especially in situations where immunity is crucial, such as during pregnancy or prior to certain medical procedures.

The Rubella IgG immunity test involves taking a blood sample to check for immunoglobulin G (IgG) antibodies that respond to the rubella virus.

IgG is a type of antibody produced by the immune system after a past rubella infection or vaccination. These antibodies support the body’s long-term immune response and typically remain in the bloodstream for life. This is different from IgM antibodies, which appear earlier and usually indicate a recent or active infection.

If IgG antibodies are detected, it usually indicates that you have developed immunity and are protected against rubella. If no antibodies are found, it suggests that you are not currently immune and may be at risk of infection.

Rubella IgG testing may be considered to determine whether you have developed immunity to rubella through past infection or vaccination, helping to guide both personal and public health decisions.

• Pregnant individuals undergoing routine antenatal screening.
• Individuals preparing for pregnancy who need to confirm immunity.
• Adults without documented MMR vaccination or uncertain immunisation records.
• Healthcare workers, especially those in obstetrics, paediatrics, or infectious disease settings.
• Employees or students in environments where proof of immunity is required.
• People recently exposed to someone diagnosed with rubella.

If you are unsure whether this test is suitable for you, consult a doctor for individualised guidance.

Rubella IgG immunity test results can be positive, negative, or equivocal, depending on the level of antibodies found in your blood. These levels are typically measured in international units per millilitre (IU/mL).

• Positive Result – Rubella-specific IgG antibodies are present at a sufficient level, indicating past infection or successful immunisation. This suggests that you are immune to rubella.
• Negative Result – No detectable IgG antibodies were found, indicating that you are not currently immune and may be at risk of infection. Vaccination is generally advised if you are not pregnant.
• Equivocal Result – The antibody level falls within an inconclusive range. Your doctor may recommend retesting after a short interval or consider vaccination based on your circumstances.

Your doctor will review the test results in the context of your medical history and vaccination records to determine the most appropriate next steps.

At ATA Medical, we offer rubella IgG immunity testing along with a range of related tests and vaccinations. Prices are as follows:

The full process for a Rubella IgG immunity test at our clinic usually takes between 30 and 60 minutes. This includes time for registration, a brief consultation, and the collection of your blood sample.

Laboratory results are generally available within 3 to 5 working days. Once the results are ready, your doctor will follow up with you by phone or email to discuss what they mean and advise you on any next steps if needed.

You do not need to follow any special preparations before having a Rubella IgG immunity test. You can eat and drink normally, and fasting is not required.

If you are currently unwell or taking medication that may influence your immune response, it is important to inform your doctor ahead of your appointment. They may recommend a different testing time to help ensure precise results.