Term: Observer-Reported Outcome (ObsRO)

a measurement based on a report of observable signs, events, or behaviors related to a patient’s health condition, provided by someone other than the patient or a health professional. These observers are typically parents, caregivers, or others who see the patient in daily life. ObsROs are especially valuable for patients who cannot reliably self-report, such as infants or individuals with cognitive impairments. Importantly, an ObsRO does not include medical judgment or interpretation — it records only what the observer has directly seen or heard.