Table 1.

Overview of ATN site transition processes by adult clinic type

	Existence of formal transition protocols at the adolescent clinics (average age of transition)	Strategies to prepare adolescents for transition at the adolescent clinics	Methods used at the adolescent clinics to facilitate adolescents’ connection to adult clinics	Process for transition outcome evaluation at the adolescent clinics
Sites where transition requires new providers and a new clinical space
Site T	No formal protocol (25 years old)	Informal discussions to prepare youth for transition		Informal, follow up for 2 visits. Case manager will maintain contact with adolescents post transition
Site S	Formal protocol - in revision Based on a protocol that allergy/ immunology uses with adolescents (24/25 years old)	Provides certificates to celebrate transition		None
Site R	Formal protocol - in revision (24 years old; cannot admit after 21)		Social worker takes youth to appointment	Informal – staff try to maintain contact even after youth transitions to adult clinic
Site Q	No formal protocol (24 years old)			Track for 3–6 months
Site O	Transition process; no formal protocol (21 years old; but can see older patients)			Informal – social worker tries maintain contact for up to one year
Site J	No formal protocol (25 years old)	Informal discussions to prepare youth for transition		Informal – staff will keep contact with youth
Site G	Formal protocol (24 years old)			Informal - trying to standardize a year follow-up (difficult with different adult sites)
Sites whose primary referral site is in the same medical system
Site N	Formal protocol; all staff know of plan but it is not written up formally (25 years old; do allow youth to come back)	“Moving Up” ceremony to celebrate transition		Informal - follow-up for 2 visits at other place (easier if stay in system) Let them come back even at 25
Site I	Formal protocol (25th birthday)		Staff takes youth over to meet adult case manager	Same system but no consent (or funds) to follow
Sites that allow adolescents to stay in the same clinical space (but who may have new providers)
Site P	Formal protocol – solidifying it (24–25 years old)		In same clinic – introduce to adult provider(s)	Tracks for 6 months
Site K	No formal protocol (24 years old)	Informal discussions to prepare youth for transition	In same clinic – introduce to adult provider(s)	Informal - get adult clinics’ schedule (can see who’s going); case manager still calls
Site H	No formal protocol (~23/24 years old)		In same clinic – introduce to adult provider(s)	In same clinic so easy (medical records)