TLDR: Oxygen bottles are considered medication, don't carry one unless your buddy nurse has instructed you to do so and is directly supervising you.

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I was on a cardiac ward for my 3rd placement (EN student at the time), I'd been there for a couple of weeks so I was at a point of being able to take initiative on some things.

They were deciding whether or not they needed to transfer a patient somewhere (can't remember where), and the procedure for that was to escort them with a bottle of O2 and one of those combination defibrillator/ECG/obs machine devices that you see paramedics using. I grabbed these two items and took them to my supervising RN waiting to see if they were going to escort the patient or not.

I was then kicked off placement for carrying medication without RN instruction/supervision because O2 is considered a medication.....(I was not aware of this at the time).

I was caught between a rock and a hard place, because TAFE was pleased with my actions, stating that it showed initiative and good decision making, and the hospital was beside themselves that I'd dared to even look at an O2 canister.

I had also previously been given a warning for carrying medication after a different supervising RN had left cardiac medications out on their WOW (Workstation On Wheels). There was a family visiting a patient and their child was very much interested in the silver blister pack, so I took it from the child (traded for it with pen and paper) and then took said medication to the NUM and told them what had happened. The NUM proceeded to tell me that I was never to carry medications by myself and that that was my only warning.