Solution – in use for 4 years Embed Detached Signature in ED OBX segment Only sign OBX data and not delimiters Conceptually like XML digital signature Add OBX Header block with relevant OBR/PID data Patient name, Report Title, Sender but extendable Header block is also signed Advantages Allows message to be on sent in new message Allows patient demographics to change in PID Allows data to be embedded in ORF/REF messages etc Allows Classic-XML encoding transformation
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