Using economics alongside medical audit. A case study of the management of endometriosis.

During 1993, the diagnosis and initial management of endometriosis in women was identified as an important topic to be addressed within the Gynaecology Audit Project in Scotland (GAPS). This paper documents the experience of using the medical audit data collected by this exercise to estimate the costs and outcomes associated with alternative treatments for endometriosis associated infertility. Its aim is not to draw firm policy conclusions but rather to demonstrate the economic methods and to highlight difficulties in the application of economics to audit. The average cost of medical management was found to be significantly higher than the average cost of expectant management because of the high costs of the drugs involved. There was little difference in clinical and health outcomes observed between those women managed expectantly and those women managed medically. The results of the economic assessment add cautious support to the growing volume of clinical evidence indicating expectant management as the first line treatment of choice although further research is required to substantiate these results in a larger sample of women presenting with this condition.