Herpes Simplex Virus Type 1 Immunoglobulin M Antibody (Serum)

What Does This Test Measure?

IgM antibodies are a type of antibody your immune system produces in response to an infection. In this test, we detect these antibodies specific to HSV-1, which is the virus responsible for causing cold sores and oral herpes. IgM antibodies usually appear early in the infection and can help determine if you have recently been exposed to HSV-1.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like sores, blisters, or pain in your mouth, lips, or genitals that suggest herpes infection. It may also be used to confirm a suspected diagnosis when other tests or symptoms are present, especially if you have no history of previous infections.

What Does a Positive Result Mean?

A positive result means your blood contains IgM antibodies against HSV-1, suggesting you likely had a recent infection. This does not necessarily mean you are currently experiencing symptoms, as some people may not show signs of illness. It’s important to discuss your results with your healthcare provider for further guidance.

What Does a Negative Result Mean?

A negative result means your blood did not contain detectable IgM antibodies against HSV-1 at the time of testing. This could mean you either have not been recently infected or the infection was not severe enough to produce detectable IgM antibodies. Follow-up testing or clinical evaluation may still be needed to assess your situation.