# Patient-reported outcomes (PROs)
> Patient-reported outcomes are direct reports from patients about their symptoms, functioning, quality of life or treatment experience, without interpretation by clinicians.
Source: https://www.visfo.health/glossary/patient-reported-outcomes
Updated: 2026-08-16T21:55:01.037968+00:00

What are patient-reported outcomes (PROs)?
Patient-reported outcomes are measurements based directly on information provided by patients about their health, functioning or treatment experience, without interpretation by a clinician or anyone else. They can capture symptoms such as pain and fatigue, physical or social functioning, emotional well-being, quality of life and treatment satisfaction.

PRO data are usually collected through validated questionnaires completed in clinical trials or real-world settings. A PRO is the outcome being assessed; the questionnaire or other tool used to collect it is called a patient-reported outcome measure, or PROM.

Why do patient-reported outcomes matter in market access?
PROs show how a condition or treatment affects daily life from the patient’s perspective. They complement clinical efficacy and safety endpoints, which may not fully describe whether patients feel better, function more easily or can participate in activities that matter to them.

Regulators, [health technology assessment](/glossary/health-technology-assessment-hta) bodies and payers may consider PRO evidence when judging meaningful benefit, particularly where conventional endpoints do not capture the full treatment effect. For [market access](/glossary/market-access) teams, relevant PRO results can help explain clinical value and support the evidence presented for reimbursement decisions.

How are patient-reported outcomes measured in practice?
Teams first define the concept of interest, the target population and the context in which the outcome will be measured. They then select a PROM that is suitable for the disease, treatment and patient group. Measures may be condition-specific, symptom-specific or generic enough to support comparisons across conditions.

A planned approach should cover:
- when and how patients complete the questionnaire
- the recall period patients are asked to consider
- scoring rules and handling of incomplete responses
- baseline values and the change or difference to be analysed
- whether the PRO is a primary, secondary or exploratory endpoint
- how the result will be interpreted as meaningful to patients

Collection methods should reduce avoidable burden and make it possible for the intended population to respond. Missing data, inconsistent timing and selective reporting can weaken interpretation, even when the underlying questionnaire is appropriate.

What makes a PRO measure fit for purpose?
A fit-for-purpose PROM measures the concept that matters in the intended population and setting. Its content should reflect patient experience, and its measurement properties should support the planned use. These properties commonly include reliability, validity, responsiveness to change and the ability to interpret scores.

Evidence from one condition, language or setting does not automatically establish suitability in another. Translation, cultural adaptation, mode of administration and accessibility may all affect how patients understand and complete a measure. These choices should be addressed early within the [evidence generation programme](/glossary/evidence-generation-program), rather than after data collection begins.

Where do teams commonly go wrong with PROs?
A frequent mistake is choosing a familiar questionnaire before defining the decision the evidence must support. Other problems include collecting too many measures, using an instrument that misses the treatment’s expected effect, changing administration methods without assessing the consequences, or failing to plan for missing responses.

PRO strategy is usually cross-functional. Clinical, medical, biostatistics, regulatory, HEOR and market access teams need alignment on endpoint selection, analysis and interpretation. Patient input is also important when deciding whether the concepts and questions reflect lived experience. The resulting evidence should be reported consistently in publications, submissions and the [global value dossier](/glossary/global-value-dossier-gvd).

How do PROs differ from related outcomes?
PRO is a broad category defined by who provides the information: the patient. A PROM is the instrument used to obtain that information. Health-related quality of life is one type of PRO, while symptom severity, functioning and treatment satisfaction are other possible PRO concepts.

Clinical outcomes measured by tests, devices or clinicians are not PROs, although they may assess related aspects of disease. Observer-reported outcomes come from someone other than the patient, such as a caregiver. Patient experience measures generally focus on how care was delivered, whereas PROs focus on the patient’s health status, functioning or treatment impact.