A descriptive study of health services utilization patterns, and possible factors contributing to such patterns, was conducted in April 1970 at the Zuni, New Mexico, Indian Health Service Unit. Health service utilization was explored by selected disease categories, preventative services (maternal and child health), and general population attitudes as expressed in a precoded questionnaire. The study group consisted of 121 Zuni, 38 Ramah, and 12 others. Data were obtained from the daily outpatient disease log, hospital inpatient computer data, delivery room log, stork register, inpatient-outpatient combined medical chart, and field health family folder. Findings included: in view of the high incidence of tuberculosis in the Service Unit population, the number of infants receiving PPD skin test was extremely low; 33% of the children had 2 or less well-child visits over the entire study period; 21% of all mothers did not have pre-natal care; postpartum examinations were received by 64% of Zuni and Ramah women; contraceptive methods were used by 36% of the mothers; 18% of the outpatient workload at the Zuni Hospital was attributable to non-Zuni residents; the Ramah utilized significantly less preventive services on a per capita basis; waiting time was found to be a significant factor preventing the utilization of health services. Among the recommendations were that there should be active ruboela immunization and PPD skin testing of all preschool children and additional field clinics. (NQ)