The purpose of this prospective study was to test the relationship between receipt of ancillary services (case management, advocacy, counseling) over six months and retention of youth in HIV care in the subsequent six months. Medical records of 75 youth (ages 16-25) enrolled in a comprehensive HIV care program at a university-affiliated medical center in Detroit, Michigan were reviewed for receipt of services in a 12-month period. The youth program offered medical and ancillary services in a one-stop-shopping model. The expectation for medical care for youth was at least quarterly medical appointments. A three-point scale was constructed with a score of '0' indicating no gaps (at least one medical care appointment every three months in a six-month period), a score of '1' indicating one gap (no appointment in one of the two quarters) and a score of '2' indicating two gaps (no appointments in six months). Increased receipt of ancillary services in the first six months predicted lower gap scores in the second six months, even controlling for gap scores in the first six months. Counseling appointments were the strongest predictor. Preliminary results suggest the continued need for resources allocated to ancillary services to support retention in care.