Index: firmware/App/Controllers/SyringePump.c
===================================================================
diff -u -rd4dfcd3155274d9252ddb5f10d9d081f3ecd6b5a -raeeff23d7aec8a1396393d3cb188ac03eca60ead
--- firmware/App/Controllers/SyringePump.c	(.../SyringePump.c)	(revision d4dfcd3155274d9252ddb5f10d9d081f3ecd6b5a)
+++ firmware/App/Controllers/SyringePump.c	(.../SyringePump.c)	(revision aeeff23d7aec8a1396393d3cb188ac03eca60ead)
@@ -224,6 +224,7 @@
 static BOOL syringePumpPlungerFound;                                            ///< Flag indicates plunger was found.
 static BOOL syringeVolumeAdequate;                                              ///< Flag indicates whether Heparin volume is sufficient to complete treatment.
 static BOOL syringePumpPrimeCompleted;                                          ///< Flag indicates prime operation was completed.
+static BOOL syringePumpPreLoadCompleted;                                        ///< Flag indicates preload operation was completed.
 
 static BOOL syringePumpDACVrefWriteInProgress;                                  ///< Flag indicates DAC Vref write is in progress.
 static F32  syringePumpDACVref;                                                 ///< DAC Vref setting for force sensor.
@@ -308,6 +309,7 @@
     syringePumpPlungerFound = FALSE;
     syringeVolumeAdequate = FALSE;
     syringePumpPrimeCompleted = FALSE;
+    syringePumpPreLoadCompleted = FALSE;
     syringePumpRampUpPct = 0.0;
 
     // Zero pump position counts buffer
@@ -985,6 +987,19 @@
 
 /*********************************************************************//**
  * @brief
+ * The isSyringePumpPreLoaded function determines whether the syringe pump
+ * is has been moved to preload position.
+ * @details Inputs: syringePumpPreLoadCompleted
+ * @details Outputs: none
+ * @return TRUE if syringe pump operation is in preload position, FALSE if not.
+ *************************************************************************/
+BOOL isSyringePumpPreLoaded( void )
+{
+    return syringePumpPreLoadCompleted;
+}
+
+/*********************************************************************//**
+ * @brief
  * The execSyringePumpMonitor function executes the syringe pump monitor.
  * @details Inputs: FPGA syringe pump readings
  * @details Outputs: Alarm(s) may be triggered
@@ -1369,6 +1384,7 @@
         syringePumpPlungerFound = FALSE;
         syringeVolumeAdequate = FALSE;
         syringePumpPrimeCompleted = FALSE;
+        syringePumpPreLoadCompleted = FALSE;
         // Clear insufficient volume alarm condition in case we're retracting to allow user to resolve alarm
         clearAlarmCondition( ALARM_ID_HD_SYRINGE_PUMP_NOT_ENOUGH_HEPARIN_ALARM );
     }
@@ -1412,38 +1428,34 @@
     U32  preStop  = getTreatmentParameterU32( TREATMENT_PARAM_HEPARIN_PRE_STOP_TIME );
     U32  setTxDur = getTreatmentParameterU32( TREATMENT_PARAM_TREATMENT_DURATION );
     F32  hepDurHr = ( (F32)( setTxDur - preStop ) / (F32)MIN_PER_HOUR );
+    // TODO Move this calculation earlier in the process?
     F32  txVolumeReq = SYRINGE_PUMP_PRIME_VOLUME_ML + bolusVol + ( hepDurHr * contRate );
     F32  syringeVol = ( SYRINGE_PUMP_EMPTY_POS - (F32)pos ) / SYRINGE_ENCODER_COUNTS_PER_ML;
 
-    syringePumpVolumeRequired = txVolumeReq + SYRINGE_PUMP_PRELOAD_MARGIN_VOLUME_ML;
-    txVolumeReq = txVolumeReq + SYRINGE_PUMP_PRELOAD_MARGIN_VOLUME_ML;
-
-    // Keep at Home position if large volume to deliver.
-    if ( SYRINGE_PUMP_PRELOAD_MAX_VOLUME_ML < txVolumeReq )
+    // Is syringe loaded?
+    if ( TRUE == isSyringeDetected() )
     {
-        stopPump = TRUE;
+        activateAlarmNoData( ALARM_ID_HD_SYRINGE_DETECTED );
+        stopSyringePump();
+        return result;
     }
 
+    syringePumpVolumeRequired = txVolumeReq;
+    txVolumeReq = txVolumeReq + SYRINGE_PUMP_PRELOAD_MARGIN_VOLUME_ML;
+
     // Handle ramp up
     rampSyringePump();
 
-    // Is plunger Heparin volume position detected?
-    if ( ( syringeVol <= txVolumeReq ) )
+    // Is plunger Heparin volume position detected? or volume requiring full syringe.
+    if ( ( syringeVol <= txVolumeReq ) || ( SYRINGE_PUMP_PRELOAD_MAX_VOLUME_ML < txVolumeReq ) )
     {
         stopPump = TRUE;
         syringePumpVolumeDelivered.data = 0.0;
         syringePumpSafetyVolumeDelivered = 0.0;
         syringePumpVolumeStartPosition = pos;
-        // TODO Need flag for Preload complete - check for this in SelfTests.c, handleDrySelfTestSyringePumpPrimeState
+        syringePumpPreLoadCompleted = TRUE;
     }
 
-    // Is syringe loaded?
-    if ( TRUE == isSyringeDetected() )
-    {
-        activateAlarmNoData( ALARM_ID_HD_SYRINGE_DETECTED );
-        stopPump = TRUE;
-    }
-
     // Check max position > empty + 0.5 mL
     stopPump = checkMaxTravel( stopPump, SYRINGE_PUMP_EMPTY_POS + SYRINGE_PUMP_EMPTY_POS_MARGIN );
 
@@ -1491,6 +1503,7 @@
         syringePumpVolumeDelivered.data = 0.0;
         syringePumpSafetyVolumeDelivered = 0.0;
         syringePumpVolumeStartPosition = pos;
+        syringePumpPreLoadCompleted = FALSE;
 
         // Check estimated syringe volume needed for treatment vs. volume detected - if insufficient for treatment needs, alarm
         if ( syringeVol >= txVolume )
@@ -1552,6 +1565,7 @@
         syringePumpVolumeDelivered.data = 0.0;
         syringePumpSafetyVolumeDelivered = 0.0;
         syringePumpVolumeStartPosition = syringePumpPosition.data;
+        syringePumpPreLoadCompleted = FALSE;
     }
 
     // Has syringe been removed?