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Cytomegalovirus (CMV) Antibody Screening in Serum/Plasma (Qualitative Immunoassay)

Published: August 9, 2026Updated: August 16, 2026

This test checks for antibodies to the cytomegalovirus (CMV), a common virus that can affect the immune system. Antibodies indicate if your body has ever been exposed to CMV.

Quick summary

["CMV antibodies help determine past infection risk and immune response status."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
43700-4
Short code
CMV Ur Ql Shell Vial Cult
Synonyms
CMV Ur Ql Shell Vial Cult
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
shell-vial-culture
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms of CMV infection (such as fever, fatigue, or organ-related issues), if you’re immunocompromised (e.g., due to HIV, chemotherapy, or organ transplant), or if you’re pregnant to assess potential risks to your baby. It may also be used to screen donors for blood or organs.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (usually drawn from your arm) in a serum or plasma tube. The test is quick and typically done in a lab setting.

What the Test Results Mean

A positive result means your body has detected CMV antibodies, suggesting past exposure. A negative result indicates no detectable antibodies at this time. Results alone don’t confirm active infection; they’re often used alongside clinical findings.

Common Causes of Positive Results

Positive results can occur after recovering from CMV infection, in people with long-term immune suppression, or in those who were exposed recently. False positives are rare but possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV Antibody Screen

Frequently asked questions

What does a positive result imply?
A positive result suggests your body has encountered CMV, which may indicate a history of infection. This can be important for monitoring immune status, especially in high-risk groups (e.g., transplant recipients, pregnant women). However, it doesn’t confirm active disease without additional testing.
Can a negative result mean I’m not infected now?
Yes, a negative result means no detectable antibodies at this time, but it doesn’t guarantee you’re not infected. CMV can be latent (inactive) in your body. If symptoms or risk factors are present, further testing may be needed.
Is this test used to diagnose active CMV infection?
No, this screening test is qualitative and doesn’t diagnose active infection. For active CMV, providers may order additional tests like viral load or PCR (polymerase chain reaction) to detect the virus itself.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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