diff --git a/longs/models.py b/longs/models.py
index 2a9b87e4..15314175 100644
--- a/longs/models.py
+++ b/longs/models.py
@@ -189,6 +189,7 @@ class Long(models.Model):
             #"feedback_image": [],
             #"annotations": [str(q.image_annotations)],
             "type": "long",
+            "cached": False,
         }
 
         return exam_question
@@ -377,14 +378,10 @@ class LongSeries(models.Model):
             else:
                 skipcount = skipcount + 1
 
-        print("skipped, no SliceLocation: {}".format(skipcount))
+        print("skipped, no {}: {}".format(field, skipcount))
 
         # ensure they are in the correct order
         slices = sorted(slices, key=lambda s: s[field].value)
-        #if field == "SliceLocation":
-        #    slices = sorted(slices, key=lambda s: s.SliceLocation)
-        #elif field == "InstanceNumber":
-        #    slices = sorted(slices, key=lambda s: s.InstanceNumber)
 
 
         #print(slices)
diff --git a/longs/templates/longs/long_series_viewer.html b/longs/templates/longs/long_series_viewer.html
index 425599a9..9617b76f 100755
--- a/longs/templates/longs/long_series_viewer.html
+++ b/longs/templates/longs/long_series_viewer.html
@@ -17,6 +17,7 @@ This series is not associated with any cases.
 <div>
 <a href="{% url 'longs:long_series_order_dicom' pk=series.pk %}" title="orders dicom by slice location">Order dicoms by slice location</a> 
 <a href="{% url 'longs:long_series_order_dicom_instance' pk=series.pk %}" title="orders dicom by instance number">Order dicoms by instance number</a> 
+<a href="{% url 'longs:long_series_order_dicom_SeriesInstanceUID' pk=series.pk %}" title="orders dicom by instance number">Order dicoms by SeriesInstanceUID</a> 
 <a href="{% url 'longs:long_series_order_upload_filename' pk=series.pk %}" title="orders dicom by uploaded filename">Order by uploaded filename</a> 
 </div>
 {% for image in series.images.all %}
diff --git a/longs/urls.py b/longs/urls.py
index 3ed91a4e..f331d6ce 100755
--- a/longs/urls.py
+++ b/longs/urls.py
@@ -13,6 +13,7 @@ urlpatterns = [
     path("series/<int:pk>", views.long_series_detail, name="long_series_detail"),
     path("series/<int:pk>/order_dicom", views.long_series_order_dicom, name="long_series_order_dicom"),
     path("series/<int:pk>/order_dicom_instance", views.long_series_order_dicom_instance, name="long_series_order_dicom_instance"),
+    path("series/<int:pk>/order_dicom_SeriesInstanceUID", views.long_series_order_dicom_SeriesInstanceUID, name="long_series_order_dicom_SeriesInstanceUID"),
     path("series/<int:pk>/order_upload_filename", views.long_series_order_upload_filename, name="long_series_order_upload_filename"),
     path("series/<int:pk>/delete", views.LongSeriesDelete.as_view(), name="long_series_delete"),
     # path("unchecked/", views.unchecked_list, name="unchecked_list"),
diff --git a/longs/views.py b/longs/views.py
index af23849d..87ce32ea 100755
--- a/longs/views.py
+++ b/longs/views.py
@@ -955,6 +955,16 @@ def long_series_order_dicom_instance(request, pk):
 
     return redirect("longs:long_series_detail", pk=pk)
 
+@login_required
+def long_series_order_dicom_SeriesInstanceUID(request, pk):
+    series = get_object_or_404(LongSeries, pk=pk)
+    try:
+        series.order_by_dicom("SeriesInstanceUID")
+    except:
+        return HttpResponse('<h1>Series does not appear to contain dicoms (or field SeriesInstanceUID)</h1>')
+
+    return redirect("longs:long_series_detail", pk=pk)
+
 @login_required
 def long_series_order_upload_filename(request, pk):
     series = get_object_or_404(LongSeries, pk=pk)