PPI meaning in Medical ?

Public involvement, or PI, is the term for involving lay people (members of the general public) as volunteers or employees in an organisation's high level work. In the health / care context, it is a worldwide initiative to give the public an effective, active role in health / care research. The term "health / care" (or "health and care") covers healthcare (medical care), public health, and social care. The purpose is to align research more closely with patients' and the public’s needs, skills and experience and thereby increase its success and cost-effectiveness.

PI is the proper term for the involvement in research of anyone not professionally interested or experienced in health / care. (People with a professional background have plenty of chance to engage in such research.)

Still sometimes used is PPI, patients and public involvement. The bodies concerned, NIHR and INVOLVE (see below) have used PI rather than PPI since 2017, most notably in the UK Standards for Public Involvement cited above (2019 version, first published in 2017, last accessed 25 Jan 2020).