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Cytomegalovirus Antibody, Total (Serum/Plasma)

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

This test measures the presence of antibodies against cytomegalovirus (CMV), a common virus that can affect the immune system. Antibodies indicate your body has either encountered CMV before or is actively responding to it.

Quick summary

["CMV antibodies help determine past infection or immunity to the virus."]

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

Key facts at a glance

LOINC
5121-9
Short code
CMV Ab Titr SerPl LA
Synonyms
CMV Ab Titr SerPl 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

What This Test Measures

The test detects total CMV antibodies in your blood, which can include both IgG (long-term immunity) and IgM (recent infection) types. This helps doctors assess exposure history or active infection status.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms of CMV (e.g., fatigue, swollen lymph nodes), if you’re pregnant and at risk of passing CMV to your baby, or if you have an immune system that’s weakened (e.g., due to HIV or chemotherapy).

What to Expect

A blood sample is taken from a vein in your arm. The sample is sent to a lab where antibodies are measured using an immunoassay method. Results are typically available within 2–5 business days.

What the Results Mean

Positive results suggest past infection or current immunity. Negative results mean no detectable antibodies, which could indicate you’ve never been exposed or the test was taken too early after infection. Always discuss results with your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV Antibody Total

Frequently asked questions

Why might my doctor ask for this test?
Your doctor may use these results to guide treatment decisions, monitor immune health, or assess risk for transmitting CMV to others (e.g., during pregnancy).
What does a positive result mean for my health?
A positive result doesn’t always mean active illness—it could indicate immunity. If symptoms like fatigue or fever persist, your doctor may recommend further testing to check for active infection.
Can I get CMV from this test?
No, the test itself doesn’t transmit CMV. However, if you’re pregnant, always follow your doctor’s advice on handling blood samples to prevent exposure to others.
  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