Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r29a10234d477b500dd2a07ab269d49bd18b221eb -ra0e1bd7c36f379280db50285f23ae5c881681d8d
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 29a10234d477b500dd2a07ab269d49bd18b221eb)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision a0e1bd7c36f379280db50285f23ae5c881681d8d)
@@ -60,7 +60,7 @@
 #define STEADY_VOLUME_COUNT_SEC                             ( 10000 / LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME )  ///< Counter must be greater than 10 seconds before steady volume is true.
 #define STEADY_VOLUME_TIME_DEADLINE_MS                      ( 55 * MS_PER_SECOND )                             ///< Time in msec for the steady volume deadline time out.
 
-#define ARTERIAL_PRESSURE_BUBBLE_CLEAR_MAX_MMHG             ( 200.0F )                                         ///< Maximum arterial pressure reading (in mmHg) for bubble clear.
+#define VENOUS_PRESSURE_BUBBLE_CLEAR_MAX_MMHG               ( 200.0F )                                         ///< Maximum arterial pressure reading (in mmHg) for bubble clear.
 
 /// States of the treatment reservoir management state machine.
 typedef enum PrimeReservoirMgmt_States
@@ -755,7 +755,7 @@
         setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
         bubbleClearActive = TRUE;
     }
-    if ( ( TRUE == bubbleClearActive ) && ( getFilteredArterialPressure() > ARTERIAL_PRESSURE_BUBBLE_CLEAR_MAX_MMHG ) )
+    if ( ( TRUE == bubbleClearActive ) && ( getMeasuredVenousPressure() > VENOUS_PRESSURE_BUBBLE_CLEAR_MAX_MMHG ) )
     {
         // Pressure max reached, release pressure
         setValvePosition( VDI, VALVE_POSITION_A_INSERT_EJECT );