diff --git a/app/Services/Pacs/Sync/StudiesSync.php b/app/Services/Pacs/Sync/StudiesSync.php
index 8d12fa0..4b26c4d 100644
--- a/app/Services/Pacs/Sync/StudiesSync.php
+++ b/app/Services/Pacs/Sync/StudiesSync.php
@@ -132,6 +132,12 @@ public function getStudyDescription(mixed $orthanc_src): ?string
 
     public function transformData(mixed $orthanc_src): array
     {
+        $stable_study = (bool) data_get($orthanc_src, 'IsStable', false);
+        if (! $stable_study) {
+            // do not process unstable studies. wait for next sync when the study becomes stable
+            return [];
+        }
+
         $orthanc_uuid = strtolower($orthanc_src['ID']);
         $dicom_tags = $this->getStudyDicomTags($orthanc_uuid);
         $routing = DicomStudyRouter::matchStudy($dicom_tags);
@@ -171,12 +177,9 @@ public function transformData(mixed $orthanc_src): array
             'study_description' => $descr,
         ];
 
-        if ((bool) data_get($orthanc_src, 'IsStable', false)) {
-            $study['study_status'] = StudyLevelStatus::Unassigned->value;
-        } else {
-            $study['study_status'] = StudyLevelStatus::Pending->value;
-        }
-
+        $study['study_status'] = $stable_study
+            ? StudyLevelStatus::Unassigned->value
+            : StudyLevelStatus::Pending->value;
         $study['patient_birthdate'] = null;
         $dob = data_get($orthanc_src, 'PatientMainDicomTags.PatientBirthDate');
         if (filled($dob)) {