diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
index 20a631295..a70d83f40 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
@@ -2069,11 +2069,11 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
                 return FDGPETOverallAssessment.NA.GetEnumInt();
             }
 
-            var existPET = inDto.QuestionInfo.Any(x => x.QuestionType == QuestionType.ExistPET && x.Answer == ReadingYesOrNo.Yes.GetEnumInt());
+            var notExistPET = inDto.QuestionInfo.Any(x => x.QuestionType == QuestionType.ExistPET && x.Answer == ReadingYesOrNo.No.GetEnumInt());
 
 
            
-            if (existPET.EqEnum(ReadingYesOrNo.No))
+            if (notExistPET)
             {
                 return FDGPETOverallAssessment.NE.GetEnumInt();
             }