HealthGrids represent the next generation of advanced healthcare IT and hold the promise to resolve complex healthcare problems by integrating health information systems and healthcare entities. Healthcare could benefit from a new delivery approach using HealthGrids to better meet the bio-medical and health-related needs. Specialized services are needed to provide unified discovery of and ubiquitous access to available HealthGrid resources. This paper identifies different types of services available on HealthGrids and classifies them into two-levels, the Operational Level and the Management Level.