diff --git a/pyard/pyard.py b/pyard/pyard.py
index e8099be..a5be8ae 100644
--- a/pyard/pyard.py
+++ b/pyard/pyard.py
@@ -404,16 +404,26 @@ def redux(self, allele: str, ars_type: str) -> str:
                 return self.dup_g[allele]
             else:
                 return self.G[allele]
-        elif ars_type == "lg" and allele in self._lg:
-            return self.lg[allele]
-        elif ars_type == "lgx" and allele in self._lgx:
-            return self.lgx[allele]
+        elif ars_type == "lg":
+            if allele in self._lg:
+                return self.lg[allele]
+            else:
+                # for 'lg' when allele is not in G group,
+                # return allele with only first 2 field
+                return ':'.join(allele.split(':')[0:2]) + 'g'
+        elif ars_type == "lgx":
+            if allele in self._lgx:
+                return self.lgx[allele]
+            else:
+                # for 'lgx' when allele is not in G group,
+                # return allele with only first 2 field
+                return ':'.join(allele.split(':')[0:2])
         else:
             if self.remove_invalid:
                 if allele in self.valid:
                     return allele
                 else:
-                    return
+                    return ''
             else:
                 return allele
 
diff --git a/setup.py b/setup.py
index bcc2640..6002b54 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
 
 setup(
     name='py-ard',
-    version='0.0.18',
+    version='0.0.19',
     description="ARD reduction for HLA with python",
     long_description=readme + '\n\n' + history,
     author="CIBMTR",