It has become essential for healthcare providers to understand and measure structure, process and outcome of OPD service and its gaps. So that any perceived gaps in delivery of service is identified and suitably addressed. A study was conducted at a Public hospital, Dhaka to ascertain any service gaps between structure, process and outcome in respect of the hospital outpatient department (OPD) services. A cross- sectional study was conducted to assess the status of outpatient department of Public hospital by designing a checklist, using the Indian Public Health Standard (IPHS) and Standardization of Medical Equipment in Bangladesh as the survey statement. The checklist has been empirically evaluated in the hospital environment and has been shown as a reliable and valid instrument in that setting. The checklist was designed to measure OPD services about service provided using various service elements, using a qualitative, structured checklist by direct observation. All the survey items were completed by either the outpatient department or their physical facilities. The study on aspect shows structure in OPD that waiting area in the hospital is not earmarked and do not have separate toilet for female patients. Laboratory and equipment that were present in 90%, 64% were present in support service areas. Environmental consideration were present in 55% but do not have facilities for drinking water, Manpower in OPD were available according to authorized in the hospital. Total No. of patients were 17,401 from 1st March to 31th May, 2019. Patients per doctor in Public hospital 29:1. The study concludes that significant gaps in structure, process and outcome existed in the delivery of the hospital OPD services, which need to be addressed by focused improved efforts by the hospital management.