Measles Igg Antibodies

Measles IgG Antibodies

What it is

The Measles IgG Antibodies test measures the level of IgG antibodies against the measles virus in the blood. IgG antibodies appear after infection or vaccination and usually remain present for life, providing long-term immunity. This test helps determine whether a person has immunity to measles, either from prior infection or from vaccination.

Uses

This test is commonly used to confirm immunity to measles, especially in individuals with uncertain vaccination history, healthcare workers, or people traveling to regions where measles outbreaks occur. It can also help diagnose a past infection and support public health monitoring during outbreaks.

Symptoms That May Lead to the Test

Though typically performed for immunity verification, this test may also be ordered if someone presents with symptoms of measles such as high fever, cough, runny nose, conjunctivitis (red eyes), and a characteristic red rash. It may be used alongside IgM testing to confirm or rule out current or recent infection.

Abnormal Results

Positive IgG: Indicates immunity to measles, either from past infection or successful vaccination. A positive result generally means long-term protection.

Negative IgG: Suggests no detectable immunity to measles. In such cases, vaccination may be recommended to protect against future infection.

Risks

The test requires a standard blood draw, which carries minimal risks such as mild pain, bruising, or dizziness at the puncture site. These effects are temporary and harmless.