We are in the process of developing a clinical app and are committed to aligning it with HL7 FHIR standards. However, we lack expertise in this area and seek guidance to establish a comprehensive roadmap. Could you please provide insights into the crucial elements that need consideration throughout this development journey? Additionally, we are curious about the level of strictness in the schema adherence for HL7 FHIR, Should we implement all the fields of the each schema? I want an answer full of details and practical experiences You can make this question and its respond as a reference to the people who want to know this matter You can respond as topics and under each topic important points

@ahmed_eltabarani I'd suggest starting with a deeper review of the fhir specification https://www.hl7.org/fhir/index.html Most fields in fhir resources are not required as per the spec which can be seen here on the Patient resource for instance https://www.hl7.org/fhir/patient.html#resource

Hi @ahmed_eltabarani , welcome to the community. @node5585 made some good suggestions. I'll just add the best way to get started to first list out which data elements are most important for your app, and then map them to the FHIR standard. It's better to work backwards from your problem than to be a FHIR completionist, as not every element makes sense in every context.