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Cytomegalovirus (CMV) Antibody Screening (Serum/Plasma)

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. It helps determine if your body has ever been exposed to CMV.

Quick summary

["CMV antibodies indicate past infection or immunity, aiding in monitoring or diagnosing certain health conditions."]

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

Key facts at a glance

LOINC
90777-4
Short code
HEDIS 2019 CMV Ab
Synonyms
HEDIS 2019 CMV Ab
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

Why This Test Might Be Ordered

Doctors may order this test if you have a weakened immune system (e.g., due to HIV/AIDS, chemotherapy, or organ transplant), are pregnant, or are considering organ transplantation. It can also be used to screen blood donors or evaluate symptoms like fatigue, fever, or organ damage that may suggest CMV infection.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The sample is sent to a lab for testing.

What the Results Mean

Positive results mean your body has produced antibodies against CMV, suggesting past exposure. Negative results mean no detectable antibodies were found at this time. Results don’t confirm active infection but help assess immune status or exposure history.

Common Conditions Monitored or Diagnosed

CMV antibodies are important for monitoring immune health in people with conditions like HIV/AIDS, organ transplant recipients, or those undergoing cancer treatment. They can also help diagnose congenital CMV in newborns or assess CMV-related complications in immunocompromised individuals.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CMV Antibody Screen

Frequently asked questions

What does a positive result mean for my health?
A positive result indicates your body has likely been exposed to CMV in the past, which may provide reassurance if you’re immunocompetent. However, it doesn’t confirm whether you had symptoms or active infection. For immunocompromised patients, positive results can guide treatment decisions or monitoring for reactivation.
Can a negative result mean I’m not infected now?
Yes, a negative result means no detectable antibodies were found at this time. However, CMV can be latent (inactive) in your body, so you might develop antibodies later if exposed. If you’re immunocompromised, further testing may be needed to check for active infection.
How often should I get retested if my results are positive?
Retesting frequency depends on your health status. If you’re immunocompromised, your doctor may recommend periodic testing to monitor for CMV reactivation or other conditions. Pregnant women or blood donors may need retesting based on clinical guidelines or risk factors.
  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