We describe a microcomputer-based, stand-alone, on-line scheduling data entry and retrieval clinical data base system, specially tailored for a nuclear medicine department. It includes provision for free format clinical diagnostics text answers to each radioisotope scan. Such a system is currently installed at the Department of Medical Biophysics and Nuclear Medicine at the Hadassah University Hospital, and handles all the patient tests performed in this department. We feel that the design of an independent microprocessor-based system customized for one's department needs has indeed improved the quality of the clinical services, both in ensuring that the patient records are kept up-to-date and complete, and in providing, through fast interactive retrieval transactions, immediate answers for a given patient status.