This study assessed whether primary care based computerized screening for substance use, mental health issues and suicidal thoughts affects subsequent use of medical and behavioral health care services in adolescents. Administrative claims data were used to determine service use 6 months after a visit where screening could have occurred. Controlling for previous service use, screened youths were more likely to have post screening use than those not screened. Among the screened patients, medical service use did not differ by screening result. However, behavioral service use was higher for screened youths who screened positive for depression or suicidal thoughts.