Patient Reported Outcomes (PROs) are data reported directly by a patient on his or her own health condition, without interpretation by a doctor or anyone else. They are based on a patient’s perception of a disease and its treatment. The findings or outcomes can be measured in absolute terms (e.g. severity of a symptom, sign, or state of a disease or condition) or as a change from a previous measure.
Patient-reported outcome measures (PROMs) are the tools used to measure and collect data on PROs. Generally, findings are measured by a well-defined and reliable patient-reported outcome (PRO) instrument. The use of a PRO instrument is advised when measuring an aspect of the disease or condition that is best known by the patient or is best measured from the patient perspective.