my question is simply if you are using amps and do not want to inject the entire quantity in one day, how would you go about doing this?

i am posting this question here as many HRT users take in about 150mg/week of test and if using amps, most pharm grade amps come in at about 250mg/ml.

would it be ideal to withdraw the entire 1 mL into barrel, inject about 1/2, and then save the preloaded syringe for next week...of course you would swap out a new needle before next week's injection, but would there be any sterility issues regarding the test sitting in the barrel for a week?

any other methods to do this?

thanks in advance