Reason for changing system from "Isolate" to "Bld.pos growth"?

I noticed that the system of LOINC codes for many antimicrobial susceptibility tests are changed from “Isolate” to “Bld.pos growth”. Can someone clarify the reason for this change or point me to documentation that describes the reason, please. Google/LOINC website search did not return any pertinent results. Thank you!

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