Skip to content

Cytomegalovirus (CMV) Antibody Titration in Serum/Plasma

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

This test measures the level of antibodies against cytomegalovirus (CMV), a common virus that can affect the immune system. It helps determine if your body has ever been exposed to CMV or if you currently have immunity.

Quick summary

["Assesses past or present immunity to CMV through antibody detection."]

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

Key facts at a glance

LOINC
32170-3
Short code
CMV Ab Titr SerPl IF
Synonyms
CMV Ab Titr SerPl IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 recommend this test if you have a weakened immune system (such as due to HIV, chemotherapy, or organ transplant), are pregnant, or have been exposed to CMV. It can also help monitor immune response in certain conditions or before certain medical procedures.

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 blood is then processed to separate serum or plasma for testing.

What the Test Results Mean

Results indicate whether you have detectable CMV antibodies, which suggest prior exposure. Titration refers to the precise measurement of antibody levels over time, useful for tracking immune response.

Common Reasons for Testing

This test helps identify CMV exposure to guide treatment decisions, especially in high-risk individuals. It may also be used to confirm immunity before organ transplants or during immune-related illnesses.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Understanding CMV Antibody Titration

Short name

CMV Antibody Test

Frequently asked questions

What does a positive result mean?
A positive result means your body has detected CMV antibodies, indicating past infection or immunity. However, a positive test alone does not confirm active infection; further evaluation may be needed if symptoms or risk factors are present.
How does antibody titration help in monitoring?
Titration helps track how your immune system responds to treatment or over time. Lower antibody levels may suggest waning immunity, prompting additional monitoring or preventive measures.
Can this test detect active CMV infection?
No, this test specifically measures antibodies, which reflect past exposure or immunity. To diagnose active CMV infection, additional tests (such as viral load or PCR) are typically needed.
  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