Varicella Zoster IgM Antibodies
Private Varicella Zoster IgM testing in London for £99, measuring one recent-infection antibody marker with results expected in around 4 days.
Turnaround time
4 business days
Biomarkers count
1
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Overview of the Varicella Zoster IgM Antibodies Test
The Varicella Zoster IgM Antibodies blood test detects IgM antibodies produced in response to Varicella Zoster Virus, or VZV, the virus responsible for chickenpox and shingles.
The test assesses 1 specialist virology biomarker: Varicella Zoster Antibodies (IgM).
Primary infection with VZV causes chickenpox.
After recovery, the virus remains dormant within sensory nerve ganglia.
It can later reactivate and cause shingles, also known as herpes zoster.
IgM antibodies can appear during recent VZV infection.
However, VZV IgM has important limitations.
IgM may be detectable during both primary chickenpox and reactivation, which means it does not reliably distinguish chickenpox from shingles.
The test can also be negative in genuine acute infection.
False-positive or prolonged IgM responses can occur.
For this reason, IgM is generally considered supportive serology rather than definitive evidence of acute VZV infection.
When active chickenpox or shingles needs confirmation, PCR testing from vesicle fluid, lesion swabs or crust material is generally more direct and clinically useful.
Blood PCR has selected uses, particularly in more severe or disseminated disease.
IgM testing can still provide additional information where a compatible illness is being investigated and direct lesion PCR is unavailable or inconclusive.
The result is particularly important to interpret carefully during pregnancy and in immunocompromised patients because VZV infection can have more serious consequences.
What Does the Varicella Zoster IgM Antibodies Test Check?
The test measures IgM antibodies associated with a recent immune response to VZV. This test measures 1 specialist biomarker.
Varicella Zoster Antibodies (IgM)
Detects VZV-specific IgM antibodies that can support assessment of recent infection when interpreted alongside symptoms, exposure history and PCR where appropriate.
Who May Benefit From the Varicella Zoster IgM Antibodies Test?
VZV IgM may be useful as a supporting investigation where recent infection is suspected.
People with a recent blistering rash compatible with chickenpox - Serology can provide supporting evidence.
People with suspected recent VZV infection where PCR was not performed - IgM may provide additional information.
Pregnant people with suspected recent VZV exposure or illness - Specialist interpretation is especially important.
Immunocompromised people with an atypical VZV presentation - Additional laboratory evidence can assist assessment.
People with an uncertain previous VZV result - IgM and IgG together can provide more serological context.
People referred by a clinician for recent-infection serology - The test can supplement clinical and molecular findings.
How to Prepare
Recent vaccination and the timing of infection can influence antibody results.
Where active lesions are present, PCR from a lesion specimen can provide more direct evidence of VZV infection.
Symptoms and Reasons to Consider the Varicella Zoster IgM Antibodies Test
Varicella Zoster infection can appear differently during primary infection and reactivation.
A new generalised blistering rash - Chickenpox produces crops of vesicular lesions.
Fever with a new vesicular rash - Systemic symptoms commonly accompany primary infection.
A painful blistering rash on one side of the body - This is characteristic of shingles, although PCR is generally more useful than IgM.
Recent close contact with chickenpox followed by symptoms - Exposure timing can guide interpretation.
Possible VZV illness during pregnancy - Prompt specialist assessment is important.
Atypical rash in an immunocompromised person - VZV can produce more severe or unusual disease.
VZV IgM does not definitively diagnose acute chickenpox or shingles.
Pregnancy, immune suppression, eye involvement, severe headache, neurological symptoms or widespread shingles require prompt clinical assessment.
How to Book Your Varicella Zoster IgM Antibodies Test
The Varicella Zoster IgM test can be booked privately for supportive assessment of possible recent VZV infection.
Choose the Varicella Zoster IgM Antibodies
Select the individual VZV IgM blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy where suitable.
Attend your appointment
A trained healthcare professional collects the required venous blood sample.
Laboratory analysis
Your serum undergoes measurement of Varicella Zoster Antibodies (IgM).
Receive your results securely
Your authorised result is delivered securely and can be considered alongside IgG and PCR testing.
When Will I Receive My Results?
The current London Blood Tests page lists a turnaround of approximately 4 days after laboratory receipt.
The test undergoes specialist VZV serology and result authorisation.
PCR or additional confirmatory investigation can have a separate turnaround.
Understanding Your Results
A negative result means significant VZV IgM was not detected.
This does not completely exclude recent infection.
A positive result indicates detectable IgM associated with recent VZV immune activity.
It does not reliably distinguish primary chickenpox from shingles reactivation.
False-positive and prolonged IgM reactions can occur.
For this reason, a positive result should be interpreted with the clinical presentation.
Where active infection needs confirmation, lesion PCR generally provides stronger direct evidence.
Why Book With London Blood Tests?
London Blood Tests provides private VZV IgM testing for supportive assessment of recent Varicella Zoster infection.
Measures recent VZV antibody response - IgM can contribute to assessment of recent infection.
Can complement IgG testing - IgG provides information about previous immune exposure.
Useful when direct PCR was not obtained - Serology can add supporting information.
Relevant during pregnancy assessment - Suspected VZV infection can require careful specialist review.
Relevant to immunocompromised patients - VZV can be more clinically significant in immune suppression.
Clear limitations are recognised - IgM is not treated as definitive proof of acute infection.
Professional blood collection - Clinic and suitable home or hotel appointments are available.
Clear pricing - The Varicella Zoster IgM Antibodies test costs £99.
Private Varicella Zoster IgM Antibodies Blood Test in London
London Blood Tests provides private Varicella Zoster IgM testing for people requiring supportive serological assessment of recent infection.
The test costs £99 and measures 1 specialist virology biomarker.
Results are expected approximately 4 days after laboratory receipt.
PCR is generally preferred where active chickenpox or shingles requires direct confirmation.