diff --git a/model_server/base/roiset.py b/model_server/base/roiset.py
index 582c517af4f4d9bfff9fb8e55d2e8b6fb8d95df7..a429b61fcbd3bf1ad43f05025a3fb651e92ec694 100644
--- a/model_server/base/roiset.py
+++ b/model_server/base/roiset.py
@@ -672,12 +672,14 @@ class RoiSet(object):
 
         return InMemoryDataAccessor(om)
 
+    def get_serializable_dataframe(self) -> pd.DataFrame:
+        return self._df.drop(['expanded_slice', 'slice', 'relative_slice', 'binary_mask'], axis=1)
+
     def export_dataframe(self, csv_path: Path) -> str:
         csv_path.parent.mkdir(parents=True, exist_ok=True)
-        self._df.drop(['expanded_slice', 'slice', 'relative_slice', 'binary_mask'], axis=1).to_csv(csv_path, index=False)
+        self.get_serializable_dataframe().to_csv(csv_path, index=False)
         return csv_path.name
 
-
     def export_patch_masks(self, where: Path, pad_to: int = None, prefix='mask', expanded=False) -> pd.DataFrame:
         patches_df = self.get_patch_masks(pad_to=pad_to, expanded=expanded).copy()
 
@@ -994,10 +996,7 @@ class RoiSet(object):
 
         csv_path = where / 'dataframe' / (prefix + '.csv')
         csv_path.parent.mkdir(parents=True, exist_ok=True)
-        self._df.drop(
-            ['expanded_slice', 'slice', 'relative_slice', 'binary_mask'],
-            axis=1
-        ).to_csv(csv_path, index=False)
+        self.export_dataframe(csv_path)
 
         record['dataframe'] = str(Path('dataframe') / csv_path.name)