[giantg2]

True. I've heard of some tests coming back false positive or false negative from specific labs based on the way they did the test. I hear that Lyme disease is a particularly tricky one to get right (or has been in the past).

I've also been told that if you need tests done, it's best to get them dome during the week. Sometimes in some places the weekend team is the "B team" or techs on Friday afternoon just want to get done and make more mistakes. This seems to be similar to the research done about patient outcomes being affected by their surgeon's birthdays being on the procedure date, etc.