Which of the following is an ancillary service?

• A. Radiology
• B. Environmental services
• C. Nursing
• D. Maintenance

Answer: (A)

Ancillary services are support functions that enable clinicians to diagnose and treat patients, but they are not the primary hands-on care providers. Radiology fits this role because imaging studies like X-rays, CT scans, MRIs, and ultrasounds supply essential information that guides medical decisions. The radiology team supports diagnosis and treatment planning, but they are not the frontline caregivers delivering direct bedside care.

The other options are more focused on non-diagnostic or non-treatment areas: environmental services handles cleaning and facilities safety, maintenance takes care of building systems, and nursing provides direct patient care. While important to operations and safety, they don’t provide the diagnostic imaging that characterizes an ancillary service.