RN Nurse Externship - Nursing Student Trinity HealthRN Nurse Externship - Nursing StudentMuskegon, MichiganThe nurse extern skills guidelines are as follows: Nurse Extern may perform include but may not be limited to (provided they have had theory related to procedure in school) with documentation co-signed by a licensed registered nurse: 3. Must have successfully completed the first year of nursing clinicals and skills validation through an accredited ADN nursing program.