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Rubella Virus Antibody, IgG and IgM (Vaccine-Derived) in Serum or Plasma

Published: August 9, 2026Updated: August 16, 2026

This test checks for antibodies against rubella (German measles) virus, including both IgG (long-term immunity) and IgM (recent infection) types, often measured after vaccination.

Quick summary

["Assesses immunity to rubella virus, useful before vaccination or pregnancy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
31960-8
Short code
RUBV Ag Penis Ql
Synonyms
RUBV Ag Penis Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters for Immunity

Rubella is a contagious virus that can cause serious birth defects if a pregnant person is exposed. Measuring rubella antibodies helps determine if you have immunity from past infection or vaccination, protecting you and your baby from potential harm.

How the Test Works

Blood is drawn and tested using an immunoassay method to detect rubella-specific IgG and IgM antibodies. IgG indicates long-term immunity, while IgM suggests recent exposure or infection.

When You Might Need This Test

You may need this test before getting the rubella vaccine to ensure you’re not allergic or have immunity. It’s also recommended for pregnant people to confirm immunity before or during pregnancy.

Preparation for the Test

No special preparation is needed. Fasted or not fasted blood draws are typically fine, but avoid heavy meals right before testing if instructed by your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Rubella Antibody Panel

Frequently asked questions

What does a positive result mean?
A positive IgG result means you likely have immunity from past infection or vaccination. IgM alone may indicate recent exposure, but further testing or medical advice is needed to confirm.
Can I get vaccinated if my rubella antibody test is negative?
Yes, if your IgG levels are low or absent, your provider may recommend vaccination to build immunity. Avoid vaccination if you have a known allergy to rubella vaccine components.
How long do rubella antibodies last?
IgG antibodies typically last a lifetime after vaccination or infection, but IgM antibodies are short-lived and only indicate recent exposure.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy