diff --git a/Observation/Observation-BlastPercentage-Example.json b/Observation/Observation-BlastPercentage-Example.json
index 711a1e1..42e3c91 100644
--- a/Observation/Observation-BlastPercentage-Example.json
+++ b/Observation/Observation-BlastPercentage-Example.json
@@ -20,7 +20,7 @@
   },
   "specimen": {
     "identifier": {
-      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.24",
+      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.19",
       "value": "RR81234",
       "assigner": {
         "identifier": {
diff --git a/Observation/Observation-BlastPercentageWGSSample-Example.json b/Observation/Observation-BlastPercentageWGSSample-Example.json
index ecc9c32..b12f052 100644
--- a/Observation/Observation-BlastPercentageWGSSample-Example.json
+++ b/Observation/Observation-BlastPercentageWGSSample-Example.json
@@ -20,7 +20,7 @@
   },
   "specimen": {
     "identifier": {
-      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.24",
+      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.19",
       "value": "RR81235",
       "assigner": {
         "identifier": {
diff --git a/Observation/Observation-CellularityPatrickSammy-Example.json b/Observation/Observation-CellularityPatrickSammy-Example.json
index bb15f5f..587559d 100644
--- a/Observation/Observation-CellularityPatrickSammy-Example.json
+++ b/Observation/Observation-CellularityPatrickSammy-Example.json
@@ -14,7 +14,7 @@
   },
   "specimen": {
     "identifier": {
-      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.24",
+      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.19",
       "value": "RR81234",
       "assigner": {
         "identifier": {
diff --git a/Observation/Observation-NucleatedCellCount-Example.json b/Observation/Observation-NucleatedCellCount-Example.json
index 12ac843..42e4f1d 100644
--- a/Observation/Observation-NucleatedCellCount-Example.json
+++ b/Observation/Observation-NucleatedCellCount-Example.json
@@ -20,7 +20,7 @@
   },
   "specimen": {
     "identifier": {
-      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.24",
+      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.19",
       "value": "RR81234",
       "assigner": {
         "identifier": {
diff --git a/Observation/Observation-NucleatedCellCountWGSSample-Example.json b/Observation/Observation-NucleatedCellCountWGSSample-Example.json
index e377a2f..87509f3 100644
--- a/Observation/Observation-NucleatedCellCountWGSSample-Example.json
+++ b/Observation/Observation-NucleatedCellCountWGSSample-Example.json
@@ -20,7 +20,7 @@
   },
   "specimen": {
     "identifier": {
-      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.24",
+      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.19",
       "value": "RR81235",
       "assigner": {
         "identifier": {
diff --git a/Specimen/Specimen-BoneMarrowAspiration-Example.json b/Specimen/Specimen-BoneMarrowAspiration-Example.json
index 2788bd6..24dc06a 100644
--- a/Specimen/Specimen-BoneMarrowAspiration-Example.json
+++ b/Specimen/Specimen-BoneMarrowAspiration-Example.json
@@ -3,7 +3,7 @@
   "id": "Specimen-BoneMarrowAspiration-Example",
   "identifier": [
     {
-      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.24",
+      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.19",
       "value": "RR81234",
       "assigner": {
         "identifier": {
diff --git a/Specimen/Specimen-PatrickSammyBoneMarrowAspiration-Example.json b/Specimen/Specimen-PatrickSammyBoneMarrowAspiration-Example.json
index 27d32b4..b655148 100644
--- a/Specimen/Specimen-PatrickSammyBoneMarrowAspiration-Example.json
+++ b/Specimen/Specimen-PatrickSammyBoneMarrowAspiration-Example.json
@@ -17,7 +17,7 @@
   ],
   "identifier": [
     {
-      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.24",
+      "system": "urn:oid:2.16.840.1.113883.2.1.3.2.4.18.19",
       "value": "RR81235",
       "assigner": {
         "identifier": {