Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
They're often required for health care jobs, schools, and before pregnancy.
Why it's done
- School or job requirements
- Unknown vaccine history
- Before pregnancy
- After exposure to measles or chickenpox
Getting ready and what happens
- No preparation is needed.
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
Immune
You're protected.
Not immune
A vaccine dose may be recommended (some vaccines aren't given during pregnancy).
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related tests
Sources
Last updated 2026-11-13.