Cytomegalovirus (IgG/IgM) Antibodies
Private Cytomegalovirus (IgG/IgM) Antibodies blood test in London for £184, measuring one CMV serology profile with results in around 2 days.
Turnaround time
2 business days
Biomarkers count
1
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Overview of the Cytomegalovirus (IgG/IgM) Antibodies
The Cytomegalovirus (IgG/IgM) Antibodies blood test is a serological investigation that looks for antibodies produced in response to cytomegalovirus, commonly abbreviated to CMV.
CMV is a member of the herpesvirus family. Infection is very common and often causes no symptoms or only a mild viral illness in otherwise healthy people.
After primary infection, CMV remains latent in the body and can reactivate later.
The test contains 1 combined biomarker profile: Cytomegalovirus (IgG/IgM) Antibodies.
The profile assesses two antibody classes. CMV IgG indicates that infection has occurred at some point in the past, but a single positive IgG result cannot determine when infection happened.
CMV IgM may occur during recent primary infection, but it requires careful interpretation. IgM can persist for months after primary infection and can also appear during reinfection, reactivation or as a non-specific result.
For this reason, CMV IgM positivity alone should not be used to diagnose a recent primary CMV infection.
Where timing matters, particularly during pregnancy, additional assessment can include previous serology, repeat samples and CMV IgG avidity testing.
In immunocompromised and transplant patients, CMV PCR may be more clinically useful than antibody testing when active viral replication is the main concern.
Maternal IgG/IgM antibody testing also cannot diagnose congenital CMV infection in a newborn. Congenital CMV requires direct viral detection using an appropriate PCR-based pathway.
What Does the Cytomegalovirus (IgG/IgM) Antibodies Test Check?
This test measures 1 combined serology profile.
Cytomegalovirus (IgG/IgM) Antibodies
Assesses CMV-specific IgG and IgM antibodies. IgG indicates previous exposure, while IgM may occur with recent or non-primary infection but cannot independently establish the timing of infection.
Who May Benefit From the Cytomegalovirus (IgG/IgM) Antibodies Test?
This test may be suitable when a clinician needs information about previous CMV exposure or when recent infection is being considered within a broader clinical assessment.
People with a mononucleosis-like illness where CMV is being considered - CMV can cause fever, fatigue and systemic symptoms similar to other viral infections.
People with prolonged unexplained fever and fatigue - Serology may form part of a wider viral investigation where CMV is clinically plausible.
People with abnormal liver enzymes during a viral-type illness - CMV can occasionally cause mild hepatitis during primary infection.
People requiring evidence of previous CMV exposure - CMV IgG can show whether infection has occurred at some point previously.
People undergoing specialist fertility or pregnancy assessment - CMV serology may occasionally be requested, although interpretation during pregnancy requires particular care.
Pregnant people with suspected recent CMV infection - IgG and IgM can contribute to assessment, but IgM alone cannot date infection and further specialist testing may be required.
Transplant donors or recipients where serological CMV status is required - Pre-transplant CMV IgG status can contribute to risk stratification.
People with a previous equivocal CMV antibody result - Repeat serology may help clarify whether antibody patterns change.
Specialist-requested virology testing - The test can be arranged where a GP, infectious-disease specialist, fertility clinician or obstetric specialist has specifically requested CMV serology.
How to Prepare
Do not alter prescribed treatment in preparation for CMV antibody testing.
Where recent primary infection must be distinguished from previous infection, one antibody result may not be sufficient and repeat or additional testing may be required.
Symptoms and Reasons to Consider the Cytomegalovirus (IgG/IgM) Antibodies Test
Most healthy people with CMV have no symptoms. When symptomatic primary infection occurs, it can resemble glandular fever.
Persistent fever - Primary CMV infection can produce a prolonged febrile illness.
Marked fatigue - Tiredness can continue for several weeks following some symptomatic CMV infections.
Swollen lymph nodes - Lymphadenopathy can occur during a mononucleosis-like viral illness.
Muscle aches or general malaise - Non-specific systemic symptoms can accompany infection.
Sore throat - CMV can sometimes cause a glandular-fever-type illness, although throat symptoms may be less prominent than with EBV.
Abnormal liver-function results - Mild liver enzyme elevations can occur during symptomatic CMV infection.
A previous CMV antibody result requiring clarification - Repeat testing may be considered where an earlier pattern was equivocal.
Possible recent infection during pregnancy - Symptoms or serological findings during pregnancy require specialist interpretation because timing and fetal risk cannot be determined from IgM alone.
These symptoms are common to many viral and non-viral illnesses and do not establish CMV infection.
CMV antibody testing is particularly nuanced during pregnancy. A positive IgM result should not be interpreted as proof that a primary infection occurred recently or during the pregnancy.
Severe illness in an immunocompromised person, significant visual symptoms, serious respiratory symptoms or concerning pregnancy findings require prompt specialist assessment.
How to Book Your Cytomegalovirus (IgG/IgM) Antibodies Test
Booking your Cytomegalovirus antibody test with London Blood Tests is straightforward.
Choose the Cytomegalovirus (IgG/IgM) Antibodies
Select the CMV serology test and review the limitations of IgG and IgM interpretation.
Select your sample collection option
Choose an in-clinic blood draw (+£35) or a home or hotel phlebotomy visit (+£60) where available.
Attend your appointment
A trained professional collects the required venous blood sample.
Laboratory analysis
Your serum is analysed for CMV IgG and IgM antibodies according to the laboratory assay.
Receive your results securely
Your authorised result is delivered securely for review yourself or with a GP, infectious-disease clinician, fertility specialist or obstetric clinician.
When Will I Receive My Results?
The expected turnaround time for the Cytomegalovirus (IgG/IgM) Antibodies test is approximately 2 days after your sample arrives at the laboratory.
Results are released after serological analysis and laboratory authorisation.
Equivocal or clinically important results may require repeat testing or additional investigations that are separate from this initial turnaround.
Understanding Your Results
If IgG and IgM are both negative, there is no serological evidence of previous CMV infection at the time of testing.
This means the person may still be susceptible to primary CMV infection.
If IgG is positive and IgM is negative, this usually indicates previous CMV infection at some point in the past.
A positive IgG result does not show exactly when infection occurred and should not be described as complete immunity because CMV can reactivate and reinfection with another strain can occur.
If IgM is positive, interpretation requires caution.
IgM can occur with recent primary infection, but it can also persist after infection, appear during reactivation or reinfection, or occasionally represent a false-positive result.
When recent primary infection is clinically important, IgG avidity, previous serology or paired samples may provide additional information.
In pregnancy, maternal IgG/IgM testing cannot determine by itself whether a fetus has become infected.
Results should therefore be reviewed within the relevant clinical context rather than interpreted using a simple “IgM equals active infection” rule.
Why Book With London Blood Tests?
Private CMV antibody testing in London - Access targeted Cytomegalovirus IgG and IgM serology privately.
Assessment of previous CMV exposure - IgG can establish whether CMV infection has occurred previously.
Supports investigation of possible recent infection - IgM can contribute to assessment when interpreted appropriately with other information.
Relevant to selected pregnancy investigations - Testing can be arranged when specifically advised, with appropriate caution regarding interpretation.
Useful in pre-transplant serological assessment - Previous CMV exposure can be clinically relevant in transplantation.
Fast laboratory turnaround - Results are expected approximately 2 days after laboratory receipt.
Clinic and home visit options - Choose professional clinic or mobile phlebotomy depending on availability.
Secure results by email - Receive your authorised report securely.
Clear pricing before booking - The Cytomegalovirus (IgG/IgM) Antibodies test costs £184.
Private Cytomegalovirus (IgG/IgM) Antibodies Blood Test in London
London Blood Tests provides the Cytomegalovirus (IgG/IgM) Antibodies blood test in London for people requiring targeted CMV serology.
The test costs £184 and contains one combined CMV IgG/IgM antibody profile.
Testing can help establish previous CMV exposure and can contribute to investigation of possible recent infection.
Because IgM is not specific for primary infection, positive or equivocal results may require additional testing, particularly where pregnancy or significant immunosuppression is involved.
Results are expected approximately 2 days after the sample reaches the laboratory.