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Immunity and infection panel

Measles, mumps, and rubella (MMR) immunity test (IgG)

Written by the Zenlo Health editorial teamUpdated 2026-10-14Education onlyHow we review
Short answerAn MMR immunity test, often called an MMR titer, measures IgG antibodies to measles, mumps, and rubella. Positive results suggest immunity from vaccination or past infection. Schools, health care jobs, and pregnancy planning are common reasons to order it.
Fasting and prep
No fasting needed. Follow the instructions on your lab order.
Turnaround
Usually 1 to 3 days. Some labs send it out, which can add time.
Also called
mmr titer, measles titer, rubella immunity, mumps titer, mmr igg, mmr antibody test

What it measures

IgG antibodies form after vaccination or infection and usually last for years. The lab reports each virus separately as positive (immune), equivocal, or negative. The CDC treats written records of two MMR doses as proof of immunity for most adults, so people with good records usually do not need a titer.

Who should consider it

  • Health care workers and students without vaccine records
  • People planning pregnancy who want to confirm rubella immunity
  • Adults who cannot find childhood vaccine records
  • Travelers who want to check measles protection before a trip

How to read your result

  • Each of the three viruses gets its own result. You can be immune to one and not another.
  • Positive means antibodies are present at a level the lab considers protective.
  • Equivocal or negative means the test did not find enough antibody, and a clinician may recommend a vaccine dose.
  • The CDC does not recommend extra doses for someone with two documented MMR doses just because a titer is low, with some exceptions for rubella in people who could become pregnant.

Reference ranges differ between labs. Use the range printed on your own report.

What to do next

If a result is negative or equivocal and you lack records of two doses, talk with a clinician about the MMR vaccine. MMR is a live vaccine, so people who are pregnant wait until after delivery, and the CDC advises avoiding pregnancy for 4 weeks after a dose. People with weakened immune systems should ask a clinician first.

Where to order Measles, mumps, and rubella

These sellers include an independent physician order. You pay online and visit a partner lab. Availability, price, and lab network vary, so confirm at checkout.

Private MD Labs

Online lab seller
Quest or LabcorpPay per testPay after results
Order
Every order reviewed by a physician. Says you pay $1 to start and the rest after results.
Results
Secure online portal with plain-English explanations. Says many results arrive overnight.
Visit site Read our review

HealthLabs

Online lab seller
Quest or LabcorpPay per test
Order
Online or by phone. No doctor referral or insurance needed.
Results
Secure HealthLabs account. Says 1 to 3 business days.
Visit site Read our review

Walk-In Lab

Online lab seller
Lab not namedPay per test
Order
Online, no insurance or doctor order needed. Shows a $6 physician fee per order on popular tests.
Results
Online account. Turnaround not stated on its homepage.
Visit site Read our review

Quest Health

Lab-run
QuestPay per testAt-home optionResults in lab account
Order
Buy online and book a Quest appointment. An independent provider is involved.
Results
Online as soon as ready, with an email alert. Provider discussion included at no extra cost.
Visit site Read our review

Seller details come from each seller's own site and can change. Confirm price, lab location, and state availability at checkout.

Ordering several tests? Plan them together · Filter all sellers

Questions people ask

Do I need an MMR titer if I have vaccine records?

Usually no. The CDC accepts records of two MMR doses as proof of immunity for most adults. Some employers or schools still ask for a titer.

What if my titer is negative after two doses?

Some vaccinated people test low and are still protected. The CDC does not routinely recommend more doses in that case, though rubella rules differ for people who could become pregnant. Ask a clinician.

Can I get the MMR vaccine while pregnant?

No. MMR is a live vaccine, so it waits until after delivery. Your prenatal team checks rubella immunity as part of routine care.

Can I order an MMR titer without a doctor?

Yes. Online sellers include a physician order and a blood draw at a partner lab. Check that your school or employer accepts the result format.

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