Index: firmware/App/Modes/Dialysis.c
===================================================================
diff -u -r8bcfdd2cad1ae2f66973c918153cbe40cc29099a -r981de1f5228152ec6877aceae3d66ebf5efc7101
--- firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision 8bcfdd2cad1ae2f66973c918153cbe40cc29099a)
+++ firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision 981de1f5228152ec6877aceae3d66ebf5efc7101)
@@ -52,6 +52,8 @@
 #define MIN_SALINE_BOLUS_VOLUME_PCT             0.8                             ///< Minimum saline bolus volume measured by independent means (as % of target).
 #define MAX_SALINE_BOLUS_VOLUME_PCT             1.2                             ///< Maximum saline bolus volume measured by independent means (as % of target).
 
+#define MAX_ACTIVE_LOAD_CELL_CHANGE_G           50.0                            ///< Maximum delta between new and previous measured UF volume.
+
 // ********** private data **********
 
 static DIALYSIS_STATE_T currentDialysisState;           ///< Current state of the dialysis sub-mode state machine.
@@ -1102,11 +1104,23 @@
 {
     DG_RESERVOIR_ID_T activeRes = getDGActiveReservoir();
     F32 latestResVolume = getReservoirWeightSmallFilter( activeRes );
+#ifndef DISABLE_UF_ALARMS
+    F32 deltaVolume = latestResVolume - resFinalVolume[ activeRes ];
 
-    // Calculate UF volumes and provide to dialysate outlet pump controller
-    measUFVolume = measUFVolumeFromPriorReservoirs + ( latestResVolume - resStartVolume[ activeRes ] );
-    resFinalVolume[ activeRes ] = latestResVolume;
-    setDialOutUFVolumes( refUFVolume, measUFVolume );
+    // ensure volume change is not too excessive - indication that load cell was impacted by some kind of shock
+    if ( fabs(deltaVolume) > MAX_ACTIVE_LOAD_CELL_CHANGE_G )
+    {
+        ALARM_ID_T deltaAlarm = ( getDGActiveReservoir() == DG_RESERVOIR_1 ? ALARM_ID_HD_LOAD_CELL_ACCELERATION_RES_1_ALARM : ALARM_ID_HD_LOAD_CELL_ACCELERATION_RES_2_ALARM );
+        SET_ALARM_WITH_1_F32_DATA( deltaAlarm, deltaVolume );
+    }
+    else
+#endif
+    {
+        // Calculate UF volumes and provide to dialysate outlet pump controller
+        measUFVolume = measUFVolumeFromPriorReservoirs + ( latestResVolume - resStartVolume[ activeRes ] );
+        resFinalVolume[ activeRes ] = latestResVolume;
+        setDialOutUFVolumes( refUFVolume, measUFVolume );
+    }
 }
 
 /*********************************************************************//**