Waiting lists are one of the main Public Health issues within developed countries. To promote appropriateness about General Practitioners' (GPs) prescriptions, during 2009 the project "Priority setting in outpatient prescriptions" in Latium Region has been approved. Regional referees, Latium Public Health Agency managers and advisors, managers and advisors of three Local Public Health Units (LPHUs) within the Latium region and some voluntarily recruited General Practitioners (each one with more than 800 patients enrolled) were included in a team work with the duty to develop the project. During two selected months of 2010, 46 GPs have forwarded overall 2.229 medical prescriptions. The six most numerous prescriptions were picked out and analyzed by the team work. 42% of these prescriptions were identified as belonging to category D of the priority level--"standard", while 42% and 41% of prescriptions bore the expressions of "control" and "diagnostic purpose" respectively. Among these ones, 75% were represented by bilateral mammography, prescribed to women aged between 50 and 69 years: but for those people bilateral mammography is already provided free of charge within the regional program of breast cancer screening, making the routine prescription by their physician a useless duplication, unacceptable in a healthcare system of good quality. Therefore at the conclusion of the project, the team work suggests proper standards be applied by healthcare professionals and GPs to achieve a significant objective: mammography appropriateness prescriptions.