Herpes can be present without any detectable symptoms, but yes, it can present as an itch, but so can many other things.
I have certainly seen false positive at 4.4 and way above but that is less likely than if your index value was below 3.5. Definitely worth confirming however.
Not clear if you are talking about giving or receiving oral sex in your post.
You can order the western blot kit and bring it to your doctor – 206-685-6066
Terri