I am not convinced that the tubes in all cases are the same as the tubs. I have had this conversation with several well respected b&b vendors & have had none to disagree. I am only speaking of the three t's . I could be wrong but I won't buy the tubes. I also don't think the lab blues & med preps are the same & this is from my personal opinion. I respect that these are very debated here. Grayson.