The CDC says anyone who tests positive with index values of 1.1 to 3.5 needs confirmation. AT 1.9, there is probably a 70% chance that this is a false positive and you need a western blot to sort this out. Also, many people who get STD tested think that herpes is included – it often is not. Also, 80% of people who have HSV 2 don’t know it so saying you are uninfected is really no better than a coin toss in terms of whether you are actually infected or not. That’s where testing helps. You need a confirmatory test, even with this information from previous partners.