What term describes something related to a patient's illness that can be observed by a responder?

The term that describes something related to a patient's illness that can be observed by a responder is "sign." In the context of medical care, a sign is an objective finding or observable indicator that signifies a medical condition. This can include physical signs such as rash, swelling, or changes in vital signs like heart rate and blood pressure, which can be measured or seen by a first responder.

Understanding the distinction between signs and symptoms is essential. Signs are observable by healthcare providers, while symptoms are subjective experiences reported by the patient, such as pain or fatigue. Knowing this distinction helps responders assess a patient's condition accurately and provide appropriate care.