Measles, Mumps, Rubella IgG Panel

The MMR IgG Panel is a blood test that checks for IgG antibodies—a specific type of immune response your body develops after exposure to measles, mumps, or rubella (German measles). These antibodies usually form after vaccination or recovery from infection, and they can provide lifelong protection. This test is a reliable way to determine whether you’re still immune to these three highly contagious viruses.

Each virus in the panel is checked individually:

• Measles IgG: Detects immunity to the measles virus, which can cause fever, cough, rash, pneumonia, and in some cases, encephalitis (brain inflammation). A positive IgG result generally means you’re protected.
• Mumps IgG: Confirms immunity against the mumps virus, which causes swelling of the salivary glands and, in some cases, complications like orchitis (inflammation of the testicles), meningitis, or hearing loss.
• Rubella IgG: Measures protection against rubella, which is usually mild in children and adults but extremely dangerous during pregnancy because it can cause severe birth defects. This part of the panel is especially important for women of childbearing age.

The IgG antibodies measured in this test are a sign of long-term immunity—think of them as the immune system’s memory. Once your body has learned how to fight off these viruses, either through vaccination or natural infection, it keeps IgG antibodies in circulation or ready to be produced quickly again if needed.