If the person is capable of responding, state your purpose and request permission.
Ask questions, do not touch or move painful, injured areas of the body and get consent to give care.
consent on what subject
Doctors do nothing without consent, although it should be noted that an unconscious person, who is unable to either give or withhold consent, may be construed to give "implied consent" (that is, we may assume he or she would consent, if he or she were conscious). The second half of your question, is there a proper way to perform, is not clear. What kind of performance do you have in mind?
If a person is injured and conscious, and they are freaking out, try to calm them down and call 991 if needed. Ask them where they are hurt(don't ask if it's obvious) and try to comfort them while waiting for the paramedics, like reassuring them that they're going to be alright, and such.
Because there is the possibility of breaking ribs
Ask them what month it is because most people in shock can't answer basic questions, if they are in shock cover them with a blanket and elevate their feet unless they have heat stroke. Also check for injuries and put pressure on bullet and knife injuries as well as pressure on any head wounds.
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If a person is diabetic and is consious but can not swallow you should call 911 immeditly and stay with the person until help arrives.
How we can stop a person being injured
Not without parental consent.
Age, sex, what is wrong, is the person conscious, where you are
What are the names of the two reflexes which protect the airway of a conscious person