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A 25-year-old female asked:

Is a hsv igm & igg blood test helpful after g herpes exposure 6+months ago? no genital outbreak, other symptoms, but have had mouth cold sores before.

1 doctor answer2 doctors weighed in
Dr. Hunter Handsfield
Infectious Disease 54 years experience
Probably yes: The HSV IgG tests are excellent, and a negative result for HSV2 6+ months after exposure shows you were not infected. The HSV1 result should have been positive if your diagnosis of past cold sores is correct, but once in a while the test misses HSV1 (but rarely HSV2). The IgM result doesn't help one way or the other -- it's inherently unreliable anyway, never done by herpes or STD experts.
Last updated Jan 8, 2019

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