This test is performed when a patient has symptoms of dengue fever
The test result is normal or negative; if the report reads dengue IgM antibodies are absent. It means
The test result is positive; if report reads dengue IgM antibodies are present. It means
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.