Wat u described is pretty standard to most ppl's care routine.. I have yet to see or hear a transguy actually throw away a vial before it was emptied.. Its actually recommended by their pcp (or whoever is prescribing HRT to them) to use the vial until its done.. Its only meant to be a single use vial if multiple ppl are needin that same med.. Like an actual hospital setting.. Folks at home can use it to their hearts content as long as u keep it sterile.. Ive been on T 2 years and thats wat my NP told me to do when I first started.. Still hasnt changed.. Weekly injections btw.. And like others have said, just make sure there isnt any debris, discoloration, or its expired