Skip to content

Cytomegalovirus (CMV) Antibody, Serum or Plasma (Qualitative or Quantitative Immunoassay)

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

This test detects 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

["CMV antibodies help determine past infection or immunity status."]

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

Key facts at a glance

LOINC
59838-3
Short code
CMV Ab SerPl Ql LA
Synonyms
CMV Ab SerPl Ql LA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
la
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

Your healthcare provider may order this test to check if you’ve been exposed to CMV, especially if you’re pregnant (to prevent potential birth defects), have a weakened immune system, or are considering organ transplants. It can also help diagnose or monitor CMV infections in certain conditions.

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. If you’re pregnant or have a history of bleeding disorders, let your provider know before the test.

What the Test Results Mean

Positive results suggest you’ve had CMV or are currently immune. Negative results mean you likely haven’t been exposed recently, but past infection may still be present. Some tests are qualitative (yes/no) or quantitative (measuring exact antibody levels).

Common Reasons for Testing

CMV antibodies are often checked during pregnancy to assess risk for congenital CMV infection in the baby. They’re also used in transplant patients to monitor immune health or prevent complications from CMV.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CMV Antibody Test

Frequently asked questions

What Does a Positive or Negative Result Indicate?
A positive CMV antibody test confirms past infection or immunity. A negative test means you likely haven’t been exposed recently, but you may still carry latent CMV. Always discuss results with your provider for personalized guidance.
Can I Get CMV from My Partner?
Yes, CMV can be spread through sexual contact, saliva, urine, or blood. Pregnant women with a negative test should discuss precautions with their provider to reduce risk of passing CMV to their baby.
How Often Should I Get This Test?
Frequency depends on your health status. Pregnant women may get retested if symptoms or risk factors change. Immunocompromised individuals might need monitoring more often, as advised by their healthcare team.
  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