Measles IgG Immunity Test

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

A measles IgG immunity test is a serological blood test that checks for the presence of IgG antibodies against the measles virus, indicating whether you have developed protection against the disease.

The test helps assess whether you have previously been infected with measles or developed immunity through vaccination. It is commonly used in situations where confirmation of immunity is needed for medical, occupational, or personal reasons, and to guide decisions on vaccination if required.

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

IgG is a type of antibody produced by the immune system after a past infection or vaccination. These antibodies are part of the body’s long-term immune response and typically remain in the bloodstream for life after exposure or immunisation.

If IgG antibodies are detected, it usually indicates that you have developed immunity and are protected against measles. If no antibodies are found, you may be at risk of infection.

A measles IgG test may be considered if you are unsure of your vaccination history or need to confirm your immunity for medical, occupational, educational, or travel-related purposes.

The test is often recommended for:

• Adults without documented evidence of prior measles vaccination.
• Individuals born before routine measles vaccination became standard.
• Healthcare workers and others in high-exposure environments.
• Travellers to areas where measles is still circulating.
• Enrolling in universities or institutions that require proof of immunity.
• Pregnant and do not have documented immunity.
• People with weakened immune systems.

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

Measles IgG test results are interpreted based on the level of antibodies detected in your blood, often expressed as a measles IgG antibody index or compared against a reference measles IgG range. Results are usually categorised as positive, negative, or equivocal.

• Positive Result – IgG antibodies are present, and your antibody index falls within the immune range, indicating that you are likely protected against measles.
• Negative Result – No measurable IgG antibodies are detected, or your index is below the defined immune threshold, suggesting that you may be susceptible to measles and could benefit from vaccination.
• Equivocal Result – Your antibody index falls in a borderline range, and immunity status cannot be clearly confirmed; a repeat test or further clinical evaluation may be advised.

Your doctor will review your results alongside your medical history and vaccination records to determine the appropriate next steps.

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

The measles IgG immunity test typically takes 30 to 60 minutes at our clinic, depending on queue times and appointment flow. This includes registration, consultation, and blood sample collection.

Test results are usually ready within 3 to 5 working days. Once available, your doctor will contact you by phone or email to explain the findings and advise on any necessary follow-up.

No special preparation is required for a measles IgG immunity test. You may eat and drink normally before your appointment, and fasting is not necessary.

If you are feeling unwell or are taking medications that may affect your immune response, inform your doctor beforehand. They may advise whether the timing of your test should be adjusted for more accurate results.