Cytomegalovirus (CMV) Antibody, IgG (Serum/Plasma)
This test measures the presence of Immunoglobulin G (IgG) antibodies against cytomegalovirus (CMV), a common virus that can affect people of all ages. IgG antibodies indicate past infection or immunity.
["IgG antibodies to CMV help determine if you’ve been exposed to the virus before."]
Key facts at a glance
- LOINC
- 31795-8
- Short code
- CMV Ag SerPl Ql
- Synonyms
- CMV Ag SerPl 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
What Does This Test Measure?
The test detects IgG antibodies specific to CMV in your blood. These antibodies develop after your body has encountered the virus, either through infection or vaccination. IgG antibodies remain in your system for a longer period than other types of antibodies, providing a lasting sign of immunity or past exposure.
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms of CMV infection (such as fever, fatigue, or swollen lymph nodes), if you’re immunocompromised (e.g., due to HIV, chemotherapy, or organ transplant), or if you’re pregnant to check for potential risks to your baby.
Who Might Benefit from This Test?
People at higher risk of CMV complications, such as those with weakened immune systems, pregnant women, or individuals undergoing certain medical treatments, may receive this test. It’s also used in screening for organ transplant recipients.
What Does a Positive Result Mean?
A positive result means your body has produced IgG antibodies to CMV, suggesting you’ve likely had the virus at some point. This doesn’t always mean you’re currently infected but indicates immunity or past exposure.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive IgG result is important for monitoring immunity, especially in high-risk groups. It helps guide decisions about preventive measures, such as avoiding close contact with CMV-infected individuals if you’re pregnant or immunocompromised. A negative result means you haven’t developed IgG antibodies yet, and you may need further testing or monitoring for active infection.
Short name
CMV IgG Antibody
Frequently asked questions
What If My Test Result Is Positive?
What If My Test Result Is Negative?
How Often Should I Get This Test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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