What Should I Make of IGM Positive Result?


Quick Answer

An IGM positive result implies that a person may have been infected with dengue virus within recent weeks. The test may be requested if a person has symptoms that are linked to dengue following her or his travel to tropical areas where the virus is common. Such symptoms include easy bruising, bleeding, bone pain, headache and high fever.

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Full Answer

The test determines the level of immunoglobulins or antibodies in the blood. The antibodies are made by the immune system to help in fight foreign intruders in the body, such as toxin, viruses and bacteria. The body makes different antibodies to combat different health conditions, as stated by KidsHealth.

Antibodies tests are used to detect current or recent infection, as stated by Lab Tests Online. The test help to detect the level of two antibodies, immunoglobulin G (IgG) and immunoglobulin M (IgM) that are produced to combat a dengue fever infection.

In the case a person is exposed to the virus, IgM antibodies are produced first and the test is usually effective when conducted 7 to 9 days after the exposure, as stated by Lab Tests Online. During the first weeks, the level of IGM in the body is elevated, then it starts to decrease slowly.

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