diff --git a/IRC.Core.SCP/Service/CStoreSCPService.cs b/IRC.Core.SCP/Service/CStoreSCPService.cs
index bb9d2571f..1e2a8cb8d 100644
--- a/IRC.Core.SCP/Service/CStoreSCPService.cs
+++ b/IRC.Core.SCP/Service/CStoreSCPService.cs
@@ -42,6 +42,8 @@ namespace IRaCIS.Core.SCP.Service
 
         private List<Guid> _SCPStudyIdList { get; set; } = new List<Guid>();
 
+        private List<string> _StudyInstanceUIdList { get; set; } = new List<string>();
+
         private SCPImageUpload _upload { get; set; }
 
         private Guid _trialId { get; set; }
@@ -170,7 +172,7 @@ namespace IRaCIS.Core.SCP.Service
             var _SCPImageUploadRepository = _serviceProvider.GetService<IRepository<SCPImageUpload>>();
 
             _upload.EndTime = DateTime.Now;
-            _upload.StudyCount = _SCPStudyIdList.Count;
+            _upload.StudyCount = _StudyInstanceUIdList.Count;
             _upload.TrialId = _trialId;
             _upload.TrialSiteId = _trialSiteId;
 
@@ -270,6 +272,11 @@ namespace IRaCIS.Core.SCP.Service
                 return new DicomCStoreResponse(request, DicomStatus.Success);
             }
 
+            if (!_StudyInstanceUIdList.Contains(studyInstanceUid))
+            {
+                _StudyInstanceUIdList.Add(studyInstanceUid);
+            }
+
             //Guid studyId = IdentifierHelper.CreateGuid(studyInstanceUid, trialId.ToString());
             Guid seriesId = IdentifierHelper.CreateGuid(studyInstanceUid, seriesInstanceUid, _trialId.ToString());
             Guid instanceId = IdentifierHelper.CreateGuid(studyInstanceUid, seriesInstanceUid, sopInstanceUid, _trialId.ToString());