In 2017, a Patient Involvement Interest Group (PIIG) was created in the Spanish Network for Health Technology Assessment of the National Health System (RedETS) to facilitate and promote Patient Involvement (PI) in Health Technology Assessment (HTA). The PIIG proposed a decisional flowchart to guide researchers’ in decisions regarding PI methods in HTA. The flowchart proposed a combination of direct involvement and incorporation of patient-based evidence depending on the scope and the aims of the assessment.

This work aims to present the flowchart and the results of the evaluation of the latest experiences in PI in HTA in RedETS (2018–2020), including direct-involvement and patient-based evidence.

A survey was sent to the HTA researchers who implemented PI initiatives in RedETS assessments. The survey asked to describe their experiences, lessons learned, challenges and added value regarding the use of direct-involvement, systematic reviews (SR) and primary studies. A descriptive analysis was performed and the results were discussed in an online PIIG workshop.

Thirty-two assessments included direct PI, twenty-one SR synthesized qualitative and quantitative studies about patient experiences, values and preferences and eight included primary studies, mainly of qualitative design. Recruitment and the lack of methodological resources were the main barriers both for direct PI and primary studies. Relevance of the included studies was the main barrier for SR. Added value was found in all PI methods. Direct-involvement had an impact on the project plan and PICO definition, outcomes relevance, information about the health condition and treatments. SR contributed with relevant patient-based evidence, deeper assessment of patient experiences, values and preferences and implementation factors. Primary studies developed new or contextualized knowledge directly applicable to decision-making.

The PI flowchart has served to facilitate the incorporation of patient input in HTA reports. The different approaches implemented have allowed to provide relevant and well-grounded data in each report to inform decision-making in patient-centered healthcare provision, but it is necessary that specific training and resources are provided to enable adequate and timely implementation.