Rubella (German measles) antibody screening in serum (pre-pregnancy)

Why This Test Matters Before Pregnancy

Rubella can cause serious birth defects if you’re infected during pregnancy, including heart problems, deafness, or intellectual disabilities. This test helps confirm whether your body has built up immunity to the virus through vaccination or prior infection. If your levels are low, your doctor may recommend vaccination to prevent transmission to your baby.

How the Test Works

A small blood sample is taken from your arm. The lab uses an immunoassay (a type of test that detects antibodies) to measure your rubella antibody levels in your serum. Antibodies are proteins your immune system makes in response to infections or vaccines.

What the Results Mean

Results are typically reported as either positive (indicating immunity) or negative (meaning you may not be immune). A negative result means you should discuss vaccination with your healthcare provider to protect your baby.

What to Expect Before the Test

You can eat and drink normally before the test. Wear a loose shirt for easy access to your arm. No special preparation is needed, but inform your doctor if you’re on blood-thinning medications or have a bleeding disorder.