.0 COMPREHENSIVENESS 2.1 Insured Hospital Services Insured in-patient and out-patient hospital services in Ontario are prescribed under the Health Insurance Act, and Regulation 552 under the Act. Insured in-patient hospital services include medically required: use of operating rooms, obstetrical delivery rooms and anaesthetic facilities; necessary nursing services; laboratory, radiological and other diagnostic procedures together with the necessary interpretations for the purpose of maintaining health, preventing disease and assjisting in the diagnosis and treatment of any injury, illness or disability; drugs, biologicals laboratory, radiological and other diagnostic procedures together with the necessary interpretations for the purpose of maintaining health, preventing disease and assjisting in the diagnosis and treatment of any injury, illness or disability;