<P> A review of systems (ROS), also called a systems enquiry or systems review, is a technique used by healthcare providers for eliciting a medical history from a patient . It is often structured as a component of an admission note covering the organ systems, with a focus upon the subjective symptoms perceived by the patient (as opposed to the objective signs perceived by the clinician). Along with the physical examination, it can be particularly useful in identifying conditions that do not have precise diagnostic tests . </P> <P> Whatever system a specific condition may seem restricted to, it may be reasonable to review all the other systems in a comprehensive history . Different sources describe slightly different systems of organizing the organ systems . However, the following are examples of what can be included: </P>

The review of systems (ros) is considered part of