Hello. I can relate. Back problems, pain meds and the dreaded drug test. I believe it can vary from one individual to another as to how long it would take to eliminate
hydrocodone from your system. I would try and avoid using for at least 72 hours and drink plenty of water every day. The day of your test, drink water until your urine is clear and you should be OK. I've heard that, when giving a urine sample, it's best to start and stop and give a sample, and then finish. Avoid giving the beginning or the end of the stream. I can tell you that I've dealt with addiction to painkillers for years and I'm going to paste a quote I read somewhere that pretty much sums it up:
"It takes a strong willed person to be able to resist the temptations of Mother
Opium, but if you don't, she will teach you a harsh lesson, one that you won't soon forget. She will have a pound of your flesh, and many more of your sanity."
Good luck.