Index: firmware/App/Modes/StateTxBloodPrime.c
===================================================================
diff -u -r3fe89449a8859b7567cdf524727ef0ff738a706f -r11e4ed249b13d1e8a4cccbe5b5440f35d5a6decb
--- firmware/App/Modes/StateTxBloodPrime.c	(.../StateTxBloodPrime.c)	(revision 3fe89449a8859b7567cdf524727ef0ff738a706f)
+++ firmware/App/Modes/StateTxBloodPrime.c	(.../StateTxBloodPrime.c)	(revision 11e4ed249b13d1e8a4cccbe5b5440f35d5a6decb)
@@ -15,6 +15,8 @@
 *
 ***************************************************************************/
 
+
+
 #include "AirTrap.h"
 #include "BloodFlow.h"
 #include "Buttons.h"
@@ -58,6 +60,7 @@
 static BLOOD_PRIME_STATE_T bloodPrimeState;                                     ///< Current state of the blood prime sub-mode.
 static BOOL pendingPauseRequest;                                                ///< Flag indicating UI has requested blood prime pause.
 static BOOL pendingResumeRequest;                                               ///< Flag indicating UI has requested blood prime resume.
+static BOOL pendingFlowChangeRequest;                                           ///< Flag indicating UI has requested blood prime flow change
 
 static F32  bloodPrimeRampFlowRate_mL_min;                                      ///< Current blood pump ramp flow rate.
 static F32  bloodPrimeRampStep_mL;                                              ///< Blood pump volume step size for ramping.
@@ -66,6 +69,7 @@
 
 static U32  bloodPrimeRampControlTimerCtr;                                      ///< Timer counter for determining interval for controlling BP ramp.
 static U32  bloodPrimePublishTimerCtr;                                          ///< Timer counter for determining interval for blood prime status to be published.
+static U32  requestedBloodFlowRate_mL_min;                                      ///< Requested blood flow rate from UI.
 
 /// Interval (in task intervals) at which to publish blood prime data to CAN bus.
 static OVERRIDE_U32_T bloodPrimePublishInterval = { BLOOD_PRIME_DATA_PUBLISH_INTERVAL, BLOOD_PRIME_DATA_PUBLISH_INTERVAL, BLOOD_PRIME_DATA_PUBLISH_INTERVAL, 0 };
@@ -167,6 +171,7 @@
 {
     pendingPauseRequest = FALSE;
     pendingResumeRequest = FALSE;
+    pendingFlowChangeRequest = FALSE;
 }
 
 /*********************************************************************//**
@@ -257,11 +262,17 @@
         pendingPauseRequest = FALSE;
         lastBloodPrimeFlowRate_mL_min = getMeasuredBloodFlowRate();
         setBloodPumpTargetFlowRate( 0, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
-        // TODO close art/ven pinch valves?
+        // Close art/ven pinch valves
+        setValvePosition( H1_VALV, VALVE_POSITION_C_CLOSE );
+        setValvePosition( H19_VALV, VALVE_POSITION_C_CLOSE );
         result = BLOOD_PRIME_PAUSED_STATE;
     }
-    else if ( FALSE )//TODO - when UI changes blood flow rate
+    // When UI changes blood flow rate
+    else if ( TRUE == pendingFlowChangeRequest )
     {
+        pendingFlowChangeRequest = FALSE;
+        bloodPrimeRampFlowRate_mL_min = (F32)requestedBloodFlowRate_mL_min;
+        setBloodPumpTargetFlowRate( requestedBloodFlowRate_mL_min, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
         // TODO change BP rate to UI given rate
         result = BLOOD_PRIME_RUN_STATE;
     }
@@ -310,8 +321,11 @@
         // TODO close art/ven pinch valves?
         result = BLOOD_PRIME_PAUSED_STATE;
     }
-    else if ( FALSE )//TODO - when UI changes blood flow rate
+    // When UI changes blood flow rate
+    else if ( TRUE == pendingFlowChangeRequest )
     {
+        pendingFlowChangeRequest = FALSE;
+        setBloodPumpTargetFlowRate( requestedBloodFlowRate_mL_min, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
         // TODO change BP rate to UI given rate
         result = BLOOD_PRIME_RUN_STATE;
     }
@@ -336,8 +350,11 @@
     {
         pendingResumeRequest = FALSE;
         setBloodPumpTargetFlowRate( (U32)lastBloodPrimeFlowRate_mL_min, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
-        // TODO open art/ven pinch valves?
-        result = 0; // TODO return to state prior to pause
+        // open art/ven pinch valves
+        setValvePosition( H1_VALV,  VALVE_POSITION_B_OPEN );
+        setValvePosition( H19_VALV, VALVE_POSITION_B_OPEN );
+        // Return to state prior to pause
+        result = BLOOD_PRIME_RUN_STATE;
     }
 
     return result;
@@ -395,13 +412,47 @@
         }
     }
 
-    // TODO - send response
+    // Send response
+    {
+        U08 respPayload = (U08)rejReason;
+        sendMessage( MSG_ID_TD_BLOOD_PRIME_CMD_RESPONSE, COMM_BUFFER_OUT_CAN_TD_2_UI, &respPayload, sizeof(U08) );
+     }
 
     return result;
 }
 
- // TODO - handle MSG_ID_UI_TREATMENT_SET_POINT_BLOOD_FLOW_CHANGE_REQUEST and send response
+/*********************************************************************//**
+* @brief
+* The bloodPrimeHandleBloodFlowChangeRequest function handles the UI
+* treatment blood flow change request.
+* @details \b Message \b Sent: MSG_ID_TD_TREATMENT_SET_POINT_BLOOD_FLOW_CHANGE_RESPONSE
+* @details \b Inputs: message containing requested blood flow rate.
+* @details \b Outputs: pendingFlowChangeRequest set if valid.
+* @return TRUE if payload format valid, FALSE otherwise.
+*************************************************************************/
+BOOL bloodPrimeHandleBloodFlowChangeRequest( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+    REQUEST_REJECT_REASON_CODE_T rejReason = REQUEST_REJECT_REASON_INVALID_REQUEST_FORMAT;
+    if ( sizeof(U32) == message->hdr.payloadLen )
+    {
+        U32 requestedRate;
+        memcpy( &requestedRate, message->payload, sizeof(U32) );
+        result = TRUE;
+        rejReason = REQUEST_REJECT_REASON_NONE;
+        requestedBloodFlowRate_mL_min = requestedRate;
+        pendingFlowChangeRequest = TRUE;
+    }
 
+    // Send response
+    {
+        U08 respPayload = (U08)rejReason;
+        sendMessage( MSG_ID_TD_TREATMENT_SET_POINT_BLOOD_FLOW_CHANGE_RESPONSE, COMM_BUFFER_OUT_CAN_TD_2_UI, &respPayload, sizeof(U08) );
+    }
+
+   return result;
+}
+
 /*********************************************************************//**
  * @brief
  * The publishBloodPrimeData function publishes blood prime data
Index: firmware/App/Modes/StateTxBloodPrime.h
===================================================================
diff -u -r3fe89449a8859b7567cdf524727ef0ff738a706f -r11e4ed249b13d1e8a4cccbe5b5440f35d5a6decb
--- firmware/App/Modes/StateTxBloodPrime.h	(.../StateTxBloodPrime.h)	(revision 3fe89449a8859b7567cdf524727ef0ff738a706f)
+++ firmware/App/Modes/StateTxBloodPrime.h	(.../StateTxBloodPrime.h)	(revision 11e4ed249b13d1e8a4cccbe5b5440f35d5a6decb)
@@ -51,6 +51,7 @@
 
 BLOOD_PRIME_STATE_T getCurrentBloodPrimeState( void );                     // Get the current treatment sub-mode state
 BOOL bloodPrimeHandleCmdRequest( MESSAGE_T *message );                     // Handle blood prime command from UI
+BOOL bloodPrimeHandleBloodFlowChangeRequest( MESSAGE_T *message );         // Handle blood prime command from UI
 
 BOOL testBloodPrimePublishIntervalOverride( MESSAGE_T *message );
 BOOL testBloodPrimeVolumeOverride( MESSAGE_T *message );