Index: firmware/App/Modes/ModeTreatmentParams.c
===================================================================
diff -u -rfba69244d94307e50fefaa1e88bcbb979584461e -re42bc54b5c3ff134d9f4526034e3c522a64f0cdf
--- firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision fba69244d94307e50fefaa1e88bcbb979584461e)
+++ firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision e42bc54b5c3ff134d9f4526034e3c522a64f0cdf)
@@ -43,6 +43,8 @@
 
 #define NO_HEPARIN_TYPE_SET                     0xFFFFFFFF              ///< UI will send this value for Heparin type if Heparin not used
 #define INSTIT_CHEM_DISINFECT_ENABLE_RANGE      1                       ///< Institutional record chemical disinfect enable/disable allowable range
+#define INSTIT_RO_REJECTION_RATIO_MIN           0.0F                    ///< Institutional record RO rejection ratio minimum
+#define INSTIT_RO_REJECTION_RATIO_MAX           1.0F                    ///< Institutional record RO rejection ratio maximum
 
 /// Record for range and default of treatment parameters.
 typedef struct
@@ -1026,6 +1028,8 @@
                 ( nvInstRcrd->maxHeparinBolusVolumeML          <= TREAT_PARAMS_PROPERTIES[ TREATMENT_PARAM_HEPARIN_BOLUS_VOLUME ].max.sFlt )      ? TRUE : FALSE );
     result &= ( ( nvInstRcrd->minHeparinBolusVolumeML          <= nvInstRcrd->maxHeparinBolusVolumeML )                                           ? TRUE : FALSE );
     result &= ( ( nvInstRcrd->enableChemicalDisinfect          <= INSTIT_CHEM_DISINFECT_ENABLE_RANGE )                                            ? TRUE : FALSE );
+    result &= ( ( nvInstRcrd->roRejectionRatio                 >= INSTIT_RO_REJECTION_RATIO_MIN )                                                 &&
+                ( nvInstRcrd->roRejectionRatio                 <= INSTIT_RO_REJECTION_RATIO_MAX )                                                 ? TRUE : FALSE );
 
     return result;
 }
Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -rfba69244d94307e50fefaa1e88bcbb979584461e -re42bc54b5c3ff134d9f4526034e3c522a64f0cdf
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision fba69244d94307e50fefaa1e88bcbb979584461e)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision e42bc54b5c3ff134d9f4526034e3c522a64f0cdf)
@@ -1219,6 +1219,10 @@
             handleUIHDResetInServiceModeRequest( message );
             break;
 
+        case MSG_ID_DG_RO_REJ_RATIO_FROM_HD_INSTIT_RECORD_REQUEST:
+            handleDGRequestRORejectionRatio( message );
+            break;
+
         // NOTE: this always must be the last case
         case MSG_ID_TESTER_LOGIN_REQUEST:
             handleTesterLogInRequest( message );
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r371355c43e19849e5b1dd27286f62f4424d07ccf -re42bc54b5c3ff134d9f4526034e3c522a64f0cdf
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 371355c43e19849e5b1dd27286f62f4424d07ccf)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision e42bc54b5c3ff134d9f4526034e3c522a64f0cdf)
@@ -3758,7 +3758,36 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleDGRequestRORejectionRatio function handles the DG request
+ * to receive the RO rejection ratio from HD institutional record.
+ * @details Inputs: none
+ * @details Outputs: none
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleDGRequestRORejectionRatio( MESSAGE_T* message )
+{
+    if ( 0 == message->hdr.payloadLen )
+    {
+        MESSAGE_T msg;
 
+        F32 roRejectionRatioInInstitRecord = getRORejectionRatioInInstitRecord();
+
+        // Create a message record
+        blankMessage( &msg );
+        msg.hdr.msgID      = MSG_ID_HD_RO_REJ_RATIO_FROM_HD_INSTIT_RECORD_TO_DG_RESPONSE;
+        msg.hdr.payloadLen = sizeof( F32 );
+
+        memcpy( msg.payload, &roRejectionRatioInInstitRecord, sizeof( F32 ) );
+
+        // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+        serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_DG, ACK_REQUIRED );
+    }
+}
+
+
 /*************************************************************************
  *                       TEST SUPPORT FUNCTIONS
  *************************************************************************/
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r371355c43e19849e5b1dd27286f62f4424d07ccf -re42bc54b5c3ff134d9f4526034e3c522a64f0cdf
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 371355c43e19849e5b1dd27286f62f4424d07ccf)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision e42bc54b5c3ff134d9f4526034e3c522a64f0cdf)
@@ -567,6 +567,9 @@
 // MSG_ID_DG_START_STOP_PASSIVE_COOL_HEAT_DISINFECT
 BOOL sendDGStartHeatDisinfectPassiveCoolModeCommand( BOOL start );
 
+// MSG_ID_DG_RO_REJ_RATIO_FROM_HD_INSTIT_RECORD_REQUEST
+void handleDGRequestRORejectionRatio( MESSAGE_T* message );
+
 // *********** public test support message functions **********
 
 // MSG_TESTER_LOG_IN