diff --git a/src/openflexure_microscope_server/things/stage_measure.py b/src/openflexure_microscope_server/things/stage_measure.py
index 5a4f4b1d..3bfee9be 100644
--- a/src/openflexure_microscope_server/things/stage_measure.py
+++ b/src/openflexure_microscope_server/things/stage_measure.py
@@ -372,6 +372,28 @@ def _motion_detection(
 
     return stage.position
 
+def _collate_data(data: dict, time: float, csm: CSMDep) -> dict:
+    """Collate anmd calculate all useful data from ROM test.
+    
+    :param data: Dictionary created from ROM test.
+    :param time: Total time of the range of motion test.
+    :param csm: A direct_thing_client dependency for camera stage mapping.
+    """
+    x_range = abs(
+        data["positive x"]["final_position"]["x"]
+        - data["negative x"]["final_position"]["x"]
+    )
+    y_range = abs(
+        data["positive y"]["final_position"]["y"]
+        - data["negative y"]["final_position"]["y"]
+    )
+    step_range = [x_range, y_range]
+
+    data["Time"] = time
+    data["CSM Matrix"] = csm.image_to_stage_displacement_matrix
+    data["Step Range"] = step_range
+    return data
+
 
 class RangeofMotionThing(lt.Thing):
     """A class used to measure the range of motion of the stage in X and Y."""
@@ -553,20 +575,9 @@ class RangeofMotionThing(lt.Thing):
         end_time = time.time()
         total_time = (end_time - start_time) / 60
 
-        x_range = abs(
-            rom_results["positive x"]["final_position"]["x"]
-            - rom_results["negative x"]["final_position"]["x"]
-        )
-        y_range = abs(
-            rom_results["positive y"]["final_position"]["y"]
-            - rom_results["negative y"]["final_position"]["y"]
-        )
-        step_range = [x_range, y_range]
-        logger.info(f"Range of motion is {x_range} X {y_range} steps")
+        rom_results = _collate_data(data = rom_results, time=total_time, csm=csm)
 
-        rom_results["Time"] = total_time
-        rom_results["CSM Matrix"] = csm.image_to_stage_displacement_matrix
-        rom_results["Step Range"] = step_range
+        logger.info(f"Range of motion is {rom_results['Step Range'][0]} X {rom_results['Step Range'][1]} steps")
 
         self.last_calibration = DenumpifyingDict(rom_results).model_dump()
 
diff --git a/tests/test_stage_measure.py b/tests/test_stage_measure.py
index 0083bbf2..3f7a30d9 100644
--- a/tests/test_stage_measure.py
+++ b/tests/test_stage_measure.py
@@ -6,6 +6,7 @@ from openflexure_microscope_server.things.stage_measure import (
     _predict_z,
     _parasitic_detect,
     ParasiticMotionError,
+    _collate_data
 )
 
 from .mock_things.mock_csm import MockCSMThing
@@ -56,3 +57,35 @@ def test_parasitic_detect():
     mock_max = 50
     with pytest.raises(ParasiticMotionError):
         _parasitic_detect(delta=mock_delta, max_allowed_delta=mock_max)
+
+def test_collate_data():
+    """Check that the data is being collected and calculated correctly."""
+    mock_data = {
+    "positive x": {
+        "final_position": {
+            "x": 100
+        }
+    },
+    "negative x": {
+        "final_position": {
+            "x": 50
+        }
+    },
+    "positive y": {
+        "final_position": {
+            "y": 100
+        }
+    },
+    "negative y": {
+        "final_position": {
+            "y": 50
+        }
+    }
+}
+
+    mock_step_range = [50, 50]
+    
+    mock_time = 123
+    mock_dict = _collate_data(data=mock_data, time=mock_time, csm=MockCSMThing)
+
+    assert mock_dict["Step Range"] == mock_step_range
\ No newline at end of file