Cytomegalovirus (CMV) antibody test
Quick answer: This blood test measures antibodies against cytomegalovirus, a common virus that usually causes mild or no symptoms. Doctors order it when CMV infection is suspected, in pregnancy when a scan or symptoms raise concern, and sometimes for egg, sperm or embryo donors.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
- In fertility careA first CMV infection in pregnancy can affect the baby, and donor gametes are often screened for CMV.
How the test is done
- 1A nurse confirms whether IgG, IgM or avidity is requested
- 2A vein on your arm is cleaned
- 3A needle draws a tube of blood
- 4The lab measures CMV antibodies in your serum
What your results can mean
Reading your report
A positive IgM usually suggests a recent or current infection and a positive IgG a past infection or immunity, but your doctor will read the result alongside your symptoms. In pregnancy an avidity test may be added.
If the result is outside the usual range
A positive IgG with negative IgM usually means past infection, which is very common. A positive IgM can suggest a recent or reactivated infection, or be a false positive, so in pregnancy an avidity test helps judge timing.
Who usually has this test
Pregnant women with a flu-like illness or a scan concern, egg and sperm donors and recipients, and people with weak immunity.
Risks and aftercare
Most people have only a small bruise; no other care is needed.
Names and options
Also called: CMV IgG, CMV IgM, cytomegalovirus test
Options
- IgG
- IgM
Listed by the hospital as
- CYTOMEGALOVIRUS (CMV) IGG, SERUM
- CYTOMEGALOVIRUS (CMV) IGM, SERUM
Questions about this test
Why are egg and sperm donors tested for CMV?
A first CMV infection in pregnancy carries the greatest risk to a baby. Clinics may match CMV-negative recipients with CMV-negative donors to lower this risk.
How can I lower my chance of CMV in pregnancy?
CMV spreads through saliva and urine of young children. Washing hands after nappy changes and not sharing food or cups with toddlers helps.
Can CMV IgM stay positive for months?
Yes. CMV IgM can stay positive long after an infection, which is why an avidity test is often added in pregnancy.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
Waiting area
IVF lab
This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.