The rubella and varicella immunity test is a blood test that measures your immunity to the viruses that cause German measles and chickenpox. This test is often taken by pregnant women to establish immunity because rubella, and less commonly varicella, can have very serious consequences for an unborn baby.
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What's in the test?
Immunity
Rubella IgG
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Rubella IgG antibodies develop following infection with rubella or after vaccination and remain detectable for life, indicating immunity to the virus. Unlike IgM antibodies which signal recent infection, IgG antibodies show you're protected against rubella. This is particularly important to confirm before or during pregnancy, as rubella infection in pregnant women can cause congenital rubella syndrome with severe birth defects. The presence of Rubella IgG without IgM is reassuring as it means you're immune - either from previous vaccination (such as the MMR vaccine) or past natural infection - and protected against future infection.
Varicella zoster IgG
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Varicella Zoster is another name for the virus which causes chickenpox and shingles. It is a type of herpes virus and tends to infect a large proportion of the population at a young age, causing chicken pox, and from there on it lays dormant in the nerve cells. However, in about 25% of people, the virus may reactivate later in life, presenting itself as shingles, a painful blistering rash focussed on one particular area of the body. Testing for the presence of IgG in the blood indicates whether someone has previously been infected and has developed immunity to the virus.
How to prepare for your test
Prepare for your Rubella and Varicella Immunity Blood Test by following these instructions.
Medications and supplements
- Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed.
Test limitations
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