The FDA has released final guidance for industry entitled "Patient-Reported Outcome Measures: Use in Medical Product Development to Support Labeling Claims." The document describes how FDA reviews and evaluates patient-reported outcome (PRO) instruments (i.e., a questionnaire plus supporting information and documentation) used to measure treatment benefit in medical product clinical trials. It also provides recommendations on how sponsors can use study results measured by PRO instruments to support claims in approved medical product labeling.