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Cytomegalovirus (CMV) Antibody Screen, Serum/Plasma

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

This test checks for antibodies to the cytomegalovirus (CMV), a common virus that can affect nearly everyone at some point in life. Antibodies indicate your immune system has recognized and fought off the virus.

Quick summary

["This test helps determine if you’ve been exposed to CMV or if your immune system is responding to it."]

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

Key facts at a glance

LOINC
110437-1
Short code
CMV DNA Msmt Ur
Synonyms
CMV DNA Msmt Ur
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Doctors may order this test if you have symptoms like fatigue, fever, or swollen lymph nodes that could suggest an infection. It’s also used before organ transplants to check for prior exposure, which may affect transplant outcomes. Pregnant women may be tested to assess risk to the fetus.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. If you’re pregnant or have a history of blood clotting issues, let your healthcare provider know beforehand.

What the Test Results Mean

Positive results indicate your body has produced antibodies to CMV, meaning you’ve likely been exposed. Negative results suggest no detectable antibodies, meaning either you’ve never been exposed or the test was taken too early after exposure.

Common Reasons for Follow-Up

If your results are positive, your doctor may recommend further testing to confirm the type of antibodies (IgG or IgM) or monitor for active infection. If you’re pregnant, follow-up may include additional screening for CMV risk to your baby.

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 mean for my health?
A positive result means your immune system has recognized CMV, which is generally harmless for most people. However, in certain groups—such as those with weakened immune systems, pregnant women, or transplant patients—CMV can cause serious complications. Your doctor will discuss next steps based on your health history and test results.
Can this test detect active CMV infection?
This test primarily screens for past exposure by detecting antibodies. To check for active infection, your doctor may order additional tests, such as viral load testing or a different antibody test (e.g., IgM), depending on clinical suspicion.
How long should I wait before retesting if I suspect recent exposure?
If you suspect recent exposure, wait at least 2–4 weeks before retesting. Antibody levels may take time to develop after infection, so early testing may yield negative results even if you’ve been exposed.
  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