Select all of the differences between IVDR and the prior EU regulatory framework $($IVDD$)$ Risk$-$based classification v$.$ list$-$based classification IVDD was based on a predetermined list of medical conditions or diseases while IVDR takes a more flexible approach without predetermined lists. IVDR creates multiple classes based on ascending risk to patients IVDD was more expensive for diagnostics companies IVDR requires post$-$ marketing surveillance $,$ while IVDD did not require post$-$marketing surveillance.