Do I need to know what treatment was given by the hospital before I report an injury to a pupil?
There is no requirement to check that treatment is actually administered by the hospital. If the school is later told that the hospital could find no injury, not even a minor cut or abrasion, then you do not have to make a report as the law only requires you report injuries in these circumstances.
The key thing to remember when determining whether to report an incident to a pupil or other people who are not at work is if the accident that resulted in the death or injury that must be reported, arose out of or was connected with the work activity.