diff --git a/plugins/labtests/api.py b/plugins/labtests/api.py
index 2d1da62b5..670f83f0a 100644
--- a/plugins/labtests/api.py
+++ b/plugins/labtests/api.py
@@ -15,7 +15,6 @@ def serialize_model(self, instance):
         for field in fields:
             if not field.is_relation:
                 result[field.name] = getattr(instance, field.name)
-        result['department'] = instance.department
         return result
 
     def serialize_observation(self, obs):