The IVDR 2017/746 specifies in the opening text under (21), that the European Commission has the power to adopt common technical specifications for groups or categories of IVDs.
The CS are used specifically in areas where no harmonised standards exist or where they are insufficient. A manufacturer, complying to the established CS, will inherently comply with the general safety and performance requirements (GSPRs), the requirements for performance studies and performance evaluation and/or post-market follow-up.
Any CS will be published in the Official Journal of the European Union. Once published, the CS is understood to be “available” and no consultation under the PECP is necessary for that IVD.