Actually, there shouldn't be because it would be rather old and obsolete. I don't use QF but I think I saw Jeffman talking about 4.2. Well anyway, the number kind of refers to the version of QF they are on. They have to update it to keep up with the labs. You should be using the latest version and not 3.0. Since Urineluck exchanged most 3.0 for 4.0 you should be ordering the most current formula and it shouldn't be hard to find.