diff --git a/app/Libraries/Data/reference_type.json b/app/Libraries/Data/reference_type.json
index b2f9a95..23b0b58 100644
--- a/app/Libraries/Data/reference_type.json
+++ b/app/Libraries/Data/reference_type.json
@@ -5,6 +5,7 @@
     {"key": "NMRC", "value": "Numeric"},
     {"key": "TEXT", "value": "Text"},
     {"key": "THOLD", "value": "Threshold"},
-    {"key": "VSET", "value": "Value Set"}
+    {"key": "VSET", "value": "Value Set"},
+    {"key": "NOREF", "value": "No reference range"}
   ]
 }