Thanks for the info everyone. I checked my batch number on my QF 4.0 and and it ends in 08, so I think it's good to go. I'm still a little worried about keeping it the right temp. I do have a warmer but I am not going to open it until the day of the test. I think I just have the first time jitters. No matter how many people say it works, it's like I can't believe it until I try it.