Hi, So I did 3 tests for Hsb Ag 2 months between each test. First two tests were 0.33 Non-reactive, and the third one was 0.18 Non-reactive. So my question is, is it normal for the number presented in the test to be changed, because the first two test were the same number and last is different. I have thoughts it is a wrong test or the lab didn't preformed the last test well. Also, because the first two test I got the result in 3 hours and the last test I got in in about one and half hour. Am I overthinking the test ?