diff --git a/input/pagecontent/changes.md b/input/pagecontent/changes.md
index 498665dc..ff212c20 100644
--- a/input/pagecontent/changes.md
+++ b/input/pagecontent/changes.md
@@ -1,11 +1,13 @@
 ###  Release 1.0.0
 - Expected Publication date: 2025-01-24
-- Expected Publication status: TBC
+- Expected Publication status: Working Standard
 - Based on FHIR version: 4.0.1
 
 This change log documents the significant updates and resolutions implemented from version 1.0.0-ballot to 1.0.0.
 
 #### Changes in this version
+- Made the following changes to AU Core Diagnostic Result Observation:
+  - corrected base profile to AU Base Diagnostic Observation [FHIR-47116](https://jira.hl7.org/browse/FHIR-47116)
 - Made the following changes to AU Core Location:
   - removed Must Support flag and associated Obligation extensions from Location.identifier [FHIR-47105](https://jira.hl7.org/browse/FHIR-47105) and Location.mode [FHIR-47104](https://jira.hl7.org/browse/FHIR-47104)
 - Changed the Observation  search parameter 'patient' from SHALL to MAY [FHIR-47171](https://jira.hl7.org/browse/FHIR-47171)
diff --git a/input/pagecontent/general-requirements.md b/input/pagecontent/general-requirements.md
index e5efd514..f3ae5399 100644
--- a/input/pagecontent/general-requirements.md
+++ b/input/pagecontent/general-requirements.md
@@ -201,10 +201,10 @@ The table below provides a list of AU Core profile elements that allow multiple
 
 AU Core Profile |Must Support Element|Data Types
 ---|---|---
-AU Core AllergyIntolerance|AllergyIntolerance.onset[x]|dateTime, Age, Period, Range
-AU Core Condition|Condition.onset[x]|dateTime, Age, Period, Range
-AU Core Condition|Condition.abatement[x]|dateTime, Age, Period, Range
-AU Core Diagnostic Result Observation|Observation.effective[x]|dateTime, Period, Timing, instant
+AU Core AllergyIntolerance|AllergyIntolerance.onset[x]|dateTime, age, Period, Range
+AU Core Condition|Condition.onset[x]|dateTime, age, Period, Range
+AU Core Condition|Condition.abatement[x]|dateTime, age, Period, Range
+AU Core Diagnostic Result Observation|Observation.effective[x]|dateTime, Period
 AU Core Pathology Result Observation|Observation.effective[x]|dateTime, Period
 AU Core Diagnostic Result Observation|Observation.value[x]|Quantity, CodeableConcept, string, boolean, integer, Range, Ratio, SampledData, time, dateTime, Period
 AU Core Pathology Result Observation|Observation.value[x]|Quantity, CodeableConcept, string, boolean, integer, Range, Ratio, SampledData, time, dateTime, Period
diff --git a/input/resources/au-core-diagnosticresult.xml b/input/resources/au-core-diagnosticresult.xml
index 97191839..f95beb56 100644
--- a/input/resources/au-core-diagnosticresult.xml
+++ b/input/resources/au-core-diagnosticresult.xml
@@ -12,7 +12,7 @@
   <kind value="resource"/>
   <abstract value="false"/>
   <type value="Observation"/>
-  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation"/>
+  <baseDefinition value="http://hl7.org.au/fhir/StructureDefinition/au-diagnosticresult"/>
   <derivation value="constraint"/>
   <differential>
     <element id="Observation">