This may be a really stupid question but has got me worried.  I carried out a FIT test last night and posted it in a Royal  Post Box last night.  It wont be picked up until later today. The weather was minus degrees last night.  Will the test not freeze with being left inside the post box all night? That could cause a false result?  I know the poo sample is stored in some kind of solution.  Does that not freeze ?  My husband just looked at me a s though I've lost the plot.  I guess the same could be said about it being really hot weather and left inside hot post box??

Thanks for any information

Anne