The European commission published a guidance document on significant/non-significant modifications of IVD tests for IVD manufacturers:
MDCG 2022-6 Guidance on significant changes regarding the transitional provision under Article 110(3) of the IVDR
The European draft version of the guidance document on lab-developed tests that is expected fall 2022 refers to this document for significant/non-significant change. This includes information on the use of a different analyzer or modification to the method (e.g. use of a different wash bufffer is a non-significant change).
It remains to be determined if FAGG-AFMPS will require laboratories to validate and/or register such modifications.