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

Quick summary

["This screening helps assess past infection and guide further testing or treatment if needed."]

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

Key facts at a glance

LOINC
42336-8
Short code
CMV Ag Spec-#/area
Synonyms
CMV Ag Spec-#/area
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 Matters

CMV can cause serious health issues in people with weakened immune systems, such as those with HIV/AIDS, cancer, or undergoing organ transplants. Detecting antibodies helps doctors monitor risk and plan care.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually taken from your arm. The test is quick and typically done in a lab setting.

What the Test Measures

The test detects specific antibodies (proteins) your immune system produces in response to CMV. These antibodies indicate whether you’ve been exposed to the virus at some point.

When You Might Need This Test

Your doctor may recommend this test if you have a weakened immune system, are pregnant (to check for CMV risk in your baby), or have symptoms like fever, fatigue, or swollen lymph nodes that could suggest infection.

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 or Negative Result Mean?
A positive result indicates your immune system has recognized CMV, but it doesn’t confirm active infection. It may mean you’ve had the virus before or are at higher risk if exposed.
Does this test show if I currently have CMV?
No, this is a screening test for past exposure. If you suspect active infection, your doctor may recommend additional tests like viral load or PCR.
Can I get CMV from this test?
No, the test uses sterile procedures and does not expose you to the virus. Blood samples are processed safely in a lab.
  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