What this test measures
Measles IgG (immunoglobulin G) is a long-lived antibody produced by the immune system after either a natural measles infection or measles vaccination (MMR / MR). The test measures the level of these antibodies in serum to confirm whether you are immune to measles.
IgG appears about 2 weeks after exposure, peaks around 4–6 weeks, and generally stays detectable for life — which is why it is the standard marker of measles immunity rather than current infection (for current infection, IgM is the marker).
Why it matters
India has historically been one of the top contributors to global measles cases. The national measles–rubella elimination programme aims to eliminate both viruses through the MR vaccine given at 9 months and 16–24 months under the Universal Immunisation Programme. Confirming IgG immunity matters in three real-world scenarios most Indian patients face:
1. Pre-pregnancy and pregnancy screening — measles infection during pregnancy raises the risk of miscarriage, preterm labour, and low birth weight. If non-immune, vaccination is offered before conception (MMR is live and cannot be given during pregnancy itself). 2. Healthcare workers and students — many Indian medical colleges and hospitals require documented measles immunity for admission or employment. 3. Adults with uncertain vaccination history or recent exposure — IgG confirms whether previous illness or vaccines have given lasting protection.
How to prepare
No fasting required. The test can be done at any time of day. If you have just received an MMR vaccine, wait at least 4 weeks before testing — antibodies need time to develop.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Measles IgG (AU/mL or Index)[1][2] | Positive (≥ assay cut-off) = immune; below cut-off = non-immune (assay-specific) | Non-immune — past vaccination has not produced detectable antibodies, or you have never been infected/vaccinated. Adults without immunity who plan pregnancy, work in healthcare, or have a known exposure are usually advised to take an MMR booster. | Immune — antibodies are present from past infection or vaccination. Re-infection is very unlikely. No further action needed for routine screening; for pregnancy, this is reassuring. |
Measles IgG vs Measles IgM — what each tells you
| Marker | Appears | Lasts | Tells you |
|---|---|---|---|
| IgM | 4–7 days after rash | 4–8 weeks | Active or very recent measles infection |
| IgG (this test) | 2 weeks after rash / vaccination | Lifelong (usually) | Past infection or vaccine-induced immunity |
Frequently asked questions
Why would my doctor order a measles IgG?
Usually for one of three reasons: to confirm immunity before pregnancy or in early pregnancy, as part of pre-employment screening for healthcare workers, or when your vaccination history is unclear and you have been exposed.
If I am IgG-positive, am I protected for life?
Yes — measles immunity from infection or two doses of MMR/MR is generally lifelong. Very rare breakthrough infections have been described but tend to be mild and non-infectious.
My result is negative — what should I do?
Speak to your doctor about an MMR booster if you are an adult, healthcare worker, or planning pregnancy. The MMR vaccine is safe and effective; two doses give immunity in over 97% of adults.
Can I take the MMR vaccine during pregnancy?
No. MMR is a live vaccine and is not given during pregnancy. If non-immune, the vaccine is offered before conception (with a 1-month wait) or in the immediate postpartum period.
Is the IgG test useful during an active measles illness?
No — IgM (not IgG) is the test that confirms active infection. IgG may not have risen yet in the first week of illness. If your doctor suspects current measles, an IgM (and sometimes PCR) is ordered.
Do I need fasting?
No fasting is required. You can give the sample at any time of day.
How long does the report take?
Most NABL-accredited labs in Mumbai and Thane deliver measles IgG reports within 24 hours.
Related Infectious Disease tests
Tests commonly ordered alongside MEASLES ANTIBODY - IGG, or that help interpret an unexpected result.
Sources & references
- CDC — Measles Laboratory Tools · accessed 2026-05-30T00:00:00.000Z
- WHO — Measles Surveillance Manual · accessed 2026-05-30T00:00:00.000Z
- NIH MedlinePlus — Measles · accessed 2026-05-30T00:00:00.000Z
- Indian Academy of Pediatrics (IAP) — Immunisation Schedule · accessed 2026-05-30T00:00:00.000Z
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