Hi Alexanders
CST recommend that QFT-G users obtain Lithium Heparin tubes from BD or others.
Some users have confused the issue saying use Greiner not BD.
QFT-GIT obviates this confusion by supplying the tubes.
It's hard to see how temperature can be an issue; the instructions for QFT-GIT are to store them between 4/22degC and to incubate at 37degC for 16/24 hours.