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DENGUE Elisa IgM

About the test
What is this test done for?
Dengue IgM (ELISA) is a blood test used for detecting antibodies against dengue virus, which is responsible for dengue fever.
Why is it Done?
This is a routine blood test done for diagnosing dengue fever. Presence of dengue IgM in the blood indicates recent infection of dengue virus and it is the most probable cause for ongoing fever.
When should it be performed?

This test is performed when a patient has symptoms of dengue fever

  • High grade fever (Temperature above 103oF)
  • Chills and shuddering
  • Severe backache and calf pain
  • Headache and pain behind the eyes
  • Bone pain (more felt in legs)
  • Easy bruising
  • Rash all over the body with moderate to severe itching
  • Fatigue
  • Nausea and vomiting
  • Easy bleeding
How is it done
A blood sample will be collected from a vein in your arm. No special preparations like fasting required.
Results

The test result is normal or negative; if the report reads dengue IgM antibodies are absent. It means

  • No infection of dengue virus

The test result is positive; if report reads dengue IgM antibodies are present. It means

  • Dengue fever

Dengue IgM antibodies are positive in a patient who is suffering from dengue, but it becomes positive after 4th day of infection from dengue virus and it remains positive for a few weeks.

So, there are chances of falsely negative test for IgM if a patient is tested on 1st or 2nd day of fever.

Other Tests
  • NS1 antigen
    • Positive test mean dengue virus infection
  • Dengue IgG antibody
    • Presence of IgG antibodies indicate past infection from dengue virus
  • CBC
    • High hemoglobin along with low platelets and low WBC count suggest infection from dengue virus
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