government; they provide service not covered by Canada's healthcare plan including social workers In the United States, a free clinic provides free or low-cost healthcare for those without insurance. A retail-based clinic is housed in supermarkets and similar retail outlets providing walk-in health care, which may be staffed by nurse practitioners. A general out-patient clinic offers general diagnoses or treatments without an overnight stay. A polyclinic or policlinic provides a range of healthcare services (including diagnostics) without need of an overnight stay A specialist clinic provides advanced diagnostic or treatment services for specific diseases or parts of the body. This type contrasts with general out-patient clinics. A sexual health clinic deals with sexual health related problems, such as prevention and treatment of sexually transmitted infections. A gender identity clinic provides services relating to transgender health care. A fertility clinic aims to help women and couples to become pregnant. An abortion clinic is a medical facility providing abortion services to women. An ambulatory surgery clinic offers outpatient or same day surgery services, usually for surgical procedures less complicated than those requiring hospitalization. An ultrasound clinic offers medical ultrasound investigations for patients. An ultrasound clinic is normally run privately. See also Healthcare provider Health center Health systems management Healthcare system Nurse-led clinic Polyclinics in England Walk-in clinic References Types of health care facilities