What is the best course of action for a nurse caring for an emancipated adolescent with an STI who is unaccompanied by a guardian?

Having the adolescent sign a consent for treatment is the best course of action because emancipated minors have the legal right to make their own healthcare decisions, including consent for treatment of sexually transmitted infections (STIs). Emancipation typically grants adolescents the same legal rights as adults concerning medical care, which negates the need for a guardian's permission. This empowers the adolescent to take responsibility for their health and ensures that they receive the necessary treatment promptly without unnecessary delays or barriers related to guardian involvement.

Choosing to instruct the adolescent to return with a guardian or obtaining consent from guardians over the phone would not be appropriate, given that the adolescent is emancipated and legally capable of consenting to their own treatment. Treating the adolescent without a consent form could lead to ethical and legal issues, particularly if the treatment plan involves significant interventions where consent documentation is required. Therefore, the best action is to have the emancipated adolescent formally sign a consent for treatment, affirming their autonomy in managing their health care.