Use matching identifider to get index

imi-bigpicture · Jan 6, 2024 · 5f24109 · 5f24109
1 parent 81ef256
commit 5f24109
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/wsidicom/metadata/schema/dicom/sample/parser.py b/wsidicom/metadata/schema/dicom/sample/parser.py
@@ -114,7 +114,14 @@ def get_previous_specimen_identifier(
         Optional[SpecimenIdentifier]
             Identifier of previous specimen, if any.
         """
-        this_specimen_index = list(self._steps_by_identifier.keys()).index(identifier)
+        matching_identifier = self._get_identifier(
+            identifier, self._steps_by_identifier
+        )
+        if matching_identifier is None:
+            return None
+        this_specimen_index = list(self._steps_by_identifier.keys()).index(
+            matching_identifier
+        )
         if this_specimen_index == 0:
             return None
         return list(self._steps_by_identifier.keys())[this_specimen_index - 1]