* As a title: Yes, you should capitalize "Certified Respiratory Therapist" when it is used as a title before someone's name, similar to "Doctor" or "Professor." For example: "Certified Respiratory Therapist John Smith."
* As a general description: No, you don't need to capitalize "certified respiratory therapist" when used as a general description of a profession. For example: "She is a certified respiratory therapist."
Here are some examples:
* Capitalized: "Certified Respiratory Therapist Sarah Jones helped the patient breathe easier."
* Not capitalized: "My friend is a certified respiratory therapist and works in a hospital."
In general, it's best to err on the side of capitalization when referring to the title. If you're unsure, you can always consult a style guide or dictionary.