Yes, no worries. I have worked in hospitals for many years and they don't always have IV bags full. So no worries. They often have them half or a third full to start with depending on what they are giving you and how much. The pharmacy makes up a lof of what they give you. A hospital pharmacy is different than a store pharmacy. They make up a lot of their own solutions. This means they have a sterile bag of solution to start with but add antibiotics or other drugs to them or the nurse or doctor can add drugs to them as needed.
mkh9
I m sure the nurse didnt use the same bag. Some drugs come into a bag ready to drip directly into the vein. So it might not have been a saline solution. It was probably a drug that comes into bags. These are not always full of liquid. But even in the extreme case the nurse used a second hand one ( fact that i very much doubt about ) he wouldnt have got anything in a children's hospital from an other kid ( think about it ) and secodn the flow of the liquid is from up downwards, nothing goes up the bag from a persons vein ( its gravity, think about it ). Anyway I m sure they are very responsible people in a children's hospital so forget about it