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Many medical investigations and treatments for acute and chronic illnesses and preventive health care can be performed on an ambulatory basis, including minor surgical and medical procedures, most types of dental services, dermatology services, and many types of diagnostic procedures (e.g. blood tests, X-rays, endoscopy and biopsy procedures of superficial organs). Other types of ambulatory care services include emergency visits, rehabilitation visits, and in some cases telephone consultations.
Ambulatory care services represent the most significant contributor to increasing hospital expenditures and to the performance of the health care system in most countries, including most developing countries.
Health care organizations use different ways to define the nature of care provided as "ambulatory" versus inpatient or other types of care.
Sites where ambulatory care can be delivered include:
In the United States, the Urgent Care Association of America (UCAOA) estimates that over 15,000 urgent care centers deliver urgent care services. These centers are designed to evaluate and treat conditions that are not severe enough to require treatment in a hospital emergency department but still require treatment beyond normal physician office hours or before a physician appointment is available.
In Russia and other countries of the former Soviet Union, Feldsher health stations are the main site for ambulatory care in rural areas.
Hospital emergency departments: Some visits to emergency departments result in hospital admission, so these would be considered emergency medicine visits rather than ambulatory care. Most visits to hospital emergency departments, however, do not require hospital admission.
Non-medical institution-based settings: Including school and prison health; vision, dental and pharmaceutical care.
Telematic: The telemedicine-based follow-up, has proven to be feasible and safe for the evaluation of early postoperative complications. Patients reported high levels of satisfaction with the procedure. Telemedicine-based follow-up could become standard practice with the development of a specific mobile application.
Ambulatory care sensitive conditions (ACSC) are illnesses or health conditions where appropriate ambulatory care prevents or reduces the need for hospital admission. Appropriate care for an ACSC can include one or more planned revisits to settings of ambulatory care for follow-up, such as when a patient is continuously monitored or otherwise advised to return when (or if) symptoms appear or reappear.
Hospitalization for an ambulatory care sensitive conditions is considered to be a measure of access to appropriate primary health care, including preventive and disease management services. While not all admissions for these conditions are avoidable, appropriate ambulatory care could help prevent their onset, control an acute episode, or manage a chronic disease or condition.: For Medicaid-covered and uninsured U.S. hospital stays in 2012, six of the top ten diagnoses were ambulatory care sensitive conditions.
One potential complication of ambulatory care/outpatient care is the increased risk for missed outpatient appointments and medical followups. Missed appointments are common worldwide and are costly for health care systems. For example, missed outpatient appointments have been estimated to cost the National Health Service millions of pounds each year. Missed appointments also cause scheduling problems in clinics.