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The IgM antibody test is completely unreliable What you want is only IgG. I would definitely NOT rely on an IgM test to determine that you are not newly infected with herpes. And if you want a reliable IgG test in the future, I would recommend that you stop the Valtrex. Taking Valtrex longer than about 10 days can cause a false negative on the herpes antibody IgG test. How long total have you taken the Valtrex?