We studied all follow-up visits generated by initial emergency room (ER) visits made over the course of one year by patients enrolled in a pediatric primary care clinic (PCC). A total of 2,552 ER visits were made by 714 patients, 960 (37.6 percent) of these resulting in a follow-up visit. Of the 960, (82.4 percent) resulted in appointments to the PCC, with a 53.9 percent compliance rate; and 169 (17.6 percent) resulted in appointments to the ER, with an 89.3 percent compliance rate (p less than .001). Factors found to be associated with greater compliance with follow-up appointments were (1) the appointment being made to the ER rather than to the clinic, (2) the child being less than 18 months of age, (3) the patient having private insurance, and (4) an initial ER diagnosis of trauma, seizure, or burn. Factors found to be unrelated to compliance with follow-up visits were the patient's sex (when corrected for trauma cases), race, having a chronic condition, having a telephone, length of time as a clinic enrollee, distance from home to hospital, and type of primary provider (physician versus nurse practitioner).