HSV-1 and HSV-2: interpreting negative result

Hello,

I had the HSV 1/2 IgG HerpeSelect AB test performed. I am negative for both HSV-1 IgG Anitibodies (0.03) and HSV-2 IgG Antibodies (0.20). I am wondering why a negative result does not show antibodies at 0.00. Does having a .03 or .20 mean that I have some antibodies, but just very few? Or does it have to do with how the test is calibrated? If I do have some antibodies, but very few, wouldn't that mean that I was exposed at some point? If so, why is that not considered positive?

Also, my mother gets cold sores, so I can only assume that she is HSV-1 positive. I am surprised that I am not positive, if she is, because we have drank from the same glass before, etc. Does it make sense to you that I am not positive for HSV-1, even if my mother is positive for it? How is HSV-1 typically transferred? Should I no longer take a sip from her glass, for example?

Thanks!

[CuriosityAndTheCat]

I am new to this forum and meant to pose this question to a doctor. I am going to repost it in the STD expert forum. Sorry, for any repetition or confusion.