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The Herpes Simplex Virus (HSV) I & II IgM and IgG test is a blood test used to detect antibodies the body produces in response to a herpes infection, rather than detecting the virus itself. These antibodies, Immunoglobulin G (IgG) and Immunoglobulin M (IgM), serve as markers for the presence of the virus.

• IgG antibodies are highly specific and are produced when the body encounters HSV. The IgG test detects these antibodies, which indicate a past infection, even if the person had no noticeable symptoms. These antibodies typically remain in the body for life, providing long-term evidence of exposure to the virus.

• IgM antibodies, on the other hand, are produced in the early stages of infection and indicate a more recent or active herpes infection. While IgM antibodies can also provide evidence of HSV, they are not as useful for long-term detection since they fade after the initial infection.

Both IgG and IgM tests provide valuable information about the timing and history of HSV infections, and are often used together to help healthcare providers assess the status of the infection.