Which of the following is an example of an ancillary service?

Ancillary services refer to a variety of supportive services that aid in the diagnosis, treatment, and care of patients but are not considered primary care or surgical procedures. Laboratory tests fit this definition perfectly as they provide essential information needed for diagnosing conditions, monitoring health, and guiding treatment decisions.

These services typically include diagnostic imaging, laboratory testing, rehabilitation therapies, and other supportive health services that supplement the primary healthcare delivery. While primary care visits focus on general health maintenance and surgical operations are direct interventions for medical issues, laboratory tests provide vital data that assist healthcare providers in making informed clinical decisions, thus classifying them as ancillary services.