diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
index d100f636c..87c7331fe 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
@@ -2114,7 +2114,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             var splenicBottomAnswer = inDto.QuestionInfo.Where(x => x.QuestionType == QuestionType.SplenicBottomPosition).Select(x => x.Answer).FirstOrDefault();
 
             decimal? spleenLength = null;
-            if (splenicTopAnswer != null && splenicBottomAnswer != null)
+            if (splenicTopAnswer != null && splenicBottomAnswer != null&& splenicTopAnswer != string.Empty && splenicBottomAnswer != string.Empty)
             {
                 spleenLength = splenicTopAnswer.IsNullOrEmptyReturn0() - splenicBottomAnswer.IsNullOrEmptyReturn0();
                 if (spleenLength < 0)