diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 73e560257..42148db59 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,2 +1,3 @@
+* add test for Observation conversion from 10 to 40
 * add procedures conversion form dstu2 to r4
-* add medication conversion from dstu2 to r4
+* add medication conversion from dstu2 to r4
\ No newline at end of file
diff --git a/org.hl7.fhir.convertors/src/test/java/org/hl7/fhir/convertors/conv10_40/Observation10_40Test.java b/org.hl7.fhir.convertors/src/test/java/org/hl7/fhir/convertors/conv10_40/Observation10_40Test.java
new file mode 100644
index 000000000..fdf964d80
--- /dev/null
+++ b/org.hl7.fhir.convertors/src/test/java/org/hl7/fhir/convertors/conv10_40/Observation10_40Test.java
@@ -0,0 +1,31 @@
+package org.hl7.fhir.convertors.conv10_40;
+
+import org.hl7.fhir.convertors.VersionConvertorAdvisor40;
+import org.hl7.fhir.convertors.VersionConvertor_10_40;
+import org.hl7.fhir.convertors.misc.IGR2ConvertorAdvisor;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class Observation10_40Test {
+    @Test
+    @DisplayName("Test 10_40 Observation conversion")
+    public void testObservationConversion() throws IOException {
+        InputStream dstu2_input = this.getClass().getResourceAsStream("/0_observation_10.json");
+        InputStream r4_exepected_input = this.getClass().getResourceAsStream("/0_observation_40.json");
+
+        org.hl7.fhir.dstu2.model.Observation dstu2 = (org.hl7.fhir.dstu2.model.Observation) new org.hl7.fhir.dstu2.formats.JsonParser().parse(dstu2_input);
+        VersionConvertorAdvisor40 advisor = new IGR2ConvertorAdvisor();
+        org.hl7.fhir.r4.model.Resource r4_actual = VersionConvertor_10_40.convertResource(dstu2, advisor);
+
+        org.hl7.fhir.r4.formats.JsonParser r4_parser = new org.hl7.fhir.r4.formats.JsonParser();
+        org.hl7.fhir.r4.model.Resource r4_expected = r4_parser.parse(r4_exepected_input);
+
+        Assertions.assertTrue(r4_expected.equalsDeep(r4_actual),
+            "Failed comparing\n" + r4_parser.composeString(r4_actual) + "\nand\n" + r4_parser.composeString(r4_expected));
+    }
+
+}
diff --git a/org.hl7.fhir.convertors/src/test/resources/0_observation_10.json b/org.hl7.fhir.convertors/src/test/resources/0_observation_10.json
new file mode 100644
index 000000000..8017c88ae
--- /dev/null
+++ b/org.hl7.fhir.convertors/src/test/resources/0_observation_10.json
@@ -0,0 +1,42 @@
+{
+  "resourceType": "Observation",
+  "id": "fobafoba",
+  "status": "final",
+  "category": {
+    "coding": [
+      {
+        "system": "http://hl7.org/fhir/observation-category",
+        "code": "laboratory",
+        "display": "Laboratory"
+      }
+    ],
+    "text": "Laboratory"
+  },
+  "code": {
+    "coding": [
+      {
+        "system": "http://loinc.org",
+        "code": "2885-2",
+        "display": "Protein [Mass/volume] in Serum or Plasma"
+      }
+    ],
+    "text": "PROTEIN,TOTAL"
+  },
+  "subject": {
+    "display": "Mr shoko",
+    "reference": "other subject"
+  },
+  "effectiveDateTime": "2016-04-12T05:57:00Z",
+  "issued": "2016-04-12T05:57:00Z",
+  "valueQuantity": {
+    "value": 5.5,
+    "unit": "g/dL",
+    "system": "http://unitsofmeasure.org",
+    "code": "g/dL"
+  },
+  "referenceRange": [
+    {
+      "text": "6.0 - 8.2"
+    }
+  ]
+}
diff --git a/org.hl7.fhir.convertors/src/test/resources/0_observation_40.json b/org.hl7.fhir.convertors/src/test/resources/0_observation_40.json
new file mode 100644
index 000000000..2bec31579
--- /dev/null
+++ b/org.hl7.fhir.convertors/src/test/resources/0_observation_40.json
@@ -0,0 +1,44 @@
+{
+  "resourceType": "Observation",
+  "id": "fobafoba",
+  "status": "final",
+  "category": [
+    {
+      "coding": [
+        {
+          "system": "http://hl7.org/fhir/observation-category",
+          "code": "laboratory",
+          "display": "Laboratory"
+        }
+      ],
+      "text": "Laboratory"
+    }
+  ],
+  "code": {
+    "coding": [
+      {
+        "system": "http://loinc.org",
+        "code": "2885-2",
+        "display": "Protein [Mass/volume] in Serum or Plasma"
+      }
+    ],
+    "text": "PROTEIN,TOTAL"
+  },
+  "subject": {
+    "display": "Mr shoko",
+    "reference": "other subject"
+  },
+  "effectiveDateTime": "2016-04-12T05:57:00Z",
+  "issued": "2016-04-12T05:57:00Z",
+  "valueQuantity": {
+    "value": 5.5,
+    "unit": "g/dL",
+    "system": "http://unitsofmeasure.org",
+    "code": "g/dL"
+  },
+  "referenceRange": [
+    {
+      "text": "6.0 - 8.2"
+    }
+  ]
+}