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Cytomegalo Virus (CMV) - IgM
CMV IgM Antibody Test
Sample Type
blood
Fasting Required
No
Description
The CMV IgM test detects IgM antibodies in the blood, indicating a recent or current Cytomegalovirus infection. It helps diagnose acute CMV infection.
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Overview
The CMV IgM test is a blood test used to detect IgM antibodies against the cytomegalovirus (CMV), which is a common virus belonging to the herpesvirus family. The presence of IgM antibodies indicates a recent or active infection.
Risk Assessment
- High-risk groups include:
- Pregnant women (risk of congenital CMV in the fetus)
- Immunocompromised individuals (HIV/AIDS patients, transplant recipients, chemotherapy patients)
- Newborns (risk of severe complications if infected in utero)
- Healthcare workers and childcare providers (higher exposure risk)
Normal Range
- Negative (varies by lab, commonly <0.9 AU or equivalent)
- Labs may have different reference ranges; always compare with lab-specific values.
Interpretation of Results
| Result | Interpretation |
|---|---|
| Negative (<0.9 AU or equivalent) | No recent infection. |
| Equivocal (0.9-1.1 AU or equivalent) | Retesting may be needed. Could indicate early infection or a borderline result. |
| Positive (>1.1 AU or equivalent) | Recent or active CMV infection. Further testing (CMV IgG, PCR, viral culture) may be needed for confirmation. |
- IgM positive, IgG negative → Possible early infection or false-positive (confirm with PCR).
- IgM positive, IgG positive → Recent reactivation or recent primary infection.
- IgM negative, IgG positive → Past infection with immunity.
Sample Type
- Blood Sample (Serum or Plasma)
- Collected via venipuncture (drawing blood from a vein).
- No special preparation is usually required.
Frequently Asked Question
The CMV IgM test detects IgM antibodies in the blood, which indicate a recent or active Cytomegalovirus (CMV) infection. CMV is a common virus that can cause mild to severe illness, especially in people with weakened immune systems or pregnant women.
This test is used to diagnose a recent or active CMV infection. It is particularly recommended for:
Pregnant women suspected of CMV infection
Newborns with signs of congenital CMV
People with weakened immune systems (e.g., transplant patients, HIV/AIDS patients)
Individuals with unexplained fever, fatigue, or mononucleosis-like symptoms.
A blood sample is taken from a vein in the arm. The sample is then analyzed in a laboratory to check for the presence of CMV-specific IgM antibodies.
Positive: Indicates a recent or active CMV infection. Further testing (such as CMV IgG or PCR) may be needed to confirm the diagnosis.
Negative: Suggests no recent CMV infection, but a past infection is still possible.
Equivocal: Results are unclear, and retesting may be required.
Yes, CMV IgM antibodies can persist for months after an infection, leading to false positives. Cross-reactivity with other infections can also cause misleading results. Additional tests, such as CMV IgG avidity or PCR, may be needed for accurate diagnosis.
While there's no vaccine for CMV, preventive measures include:
Practicing good hygiene (frequent handwashing)
Avoiding close contact with bodily fluids of infected individuals
Safe handling of diapers, saliva, and other secretions, especially for pregnant women
Using protective measures in healthcare and daycare settings.
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Cytomegalo Virus (CMV) - IgM
CMV IgM Antibody Test
Offered by other labs
Sample Type
blood
Fasting Required
No
Description
The CMV IgM test detects IgM antibodies in the blood, indicating a recent or current Cytomegalovirus infection. It helps diagnose acute CMV infection.
Covid Safety
Assured
Free Report
Counselling
