As the number of medical web sites in various languages increases, it is increasingly necessary to establish specific criteria and control measures that give consumers some guarantee that the health web sites they are visiting, meet a minimum level of quality standards. Further, that the professionals offering the information are suitably qualified.. The paper presents briefly the current mechanisms for labelling medical web content and introduces the work done in the EC-funded project Quatro. This has defined a vocabulary for quality labels and a schema to deliver them in a machine-processable format. . In addition, the paper proposes the development of a labelling platform that will assist the work of medical labelling agencies in automating, up to a certain level, the retrieval of unlabelled medical web sites and their labelling, and the monitoring of labelled web sites as to whether they are still satisfying the criteria.