Leverage past associations
Mentioning renowned healthcare institutions where you've worked, like John Hopkins Hospital, adds to your professional standing. This subtly communicates that you've been vetted and trusted by esteemed organizations, which could increase trust in your abilities.
Use common abbreviations to save space
Space is at a premium in a LinkedIn headline, so using well-known abbreviations (like RN for Registered Nurse) saves space for more detailed information. It also signals to other professionals that you're comfortable with industry lingo.