Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r6419179374edcd65da462de84e8aeaefb7e20320 -r5d13922ee2e8c851bc5db67ef4d0120b47de6f07
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 6419179374edcd65da462de84e8aeaefb7e20320)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 5d13922ee2e8c851bc5db67ef4d0120b47de6f07)
@@ -147,8 +147,7 @@
     U32 diOccl = getMeasuredDialInPumpOcclusion();
     U32 doOccl = getMeasuredDialOutPumpOcclusion();
 
-    if ( ( bpOccl >= CARTRIDGE_LOADED_THRESHOLD ) &&
-         ( diOccl >= CARTRIDGE_LOADED_THRESHOLD ) &&
+    if ( ( bpOccl >= CARTRIDGE_LOADED_THRESHOLD ) && ( diOccl >= CARTRIDGE_LOADED_THRESHOLD ) &&
          ( doOccl >= CARTRIDGE_LOADED_THRESHOLD ) )
     {
         result = TRUE;
@@ -159,6 +158,23 @@
 
 /*********************************************************************//**
  * @brief
+ * The isCartridgeUnloaded function determines if a cartridge has been
+ * unloaded by looking at the 3 occlusion pressure sensors.
+ * @details Inputs: occlusion pressures for the pumps
+ * @details Outputs: none
+ * @return TRUE if all 3 occlusion sensors read below loaded threshold, FALSE if not.
+ *************************************************************************/
+BOOL isCartridgeUnloaded( void )
+{
+    BOOL const bpOcclBelowLoadedThreshold = getMeasuredBloodPumpOcclusion() <= CARTRIDGE_LOADED_THRESHOLD;
+    BOOL const diOcclBelowLoadedThreshold = getMeasuredDialInPumpOcclusion() <= CARTRIDGE_LOADED_THRESHOLD;
+    BOOL const doOcclBelowLoadedThreshold = getMeasuredDialOutPumpOcclusion() <= CARTRIDGE_LOADED_THRESHOLD;
+
+    return ( bpOcclBelowLoadedThreshold && diOcclBelowLoadedThreshold && doOcclBelowLoadedThreshold );
+}
+
+/*********************************************************************//**
+ * @brief
  * The isSalineBagEmpty function determines whether the saline bag is empty.
  * It is assumed that this function will only be called from mode handling
  * (General Task) when pumping (BP) from the saline bag.