Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r30f049651877229042e3f8700c8596e5b9a1e0f4 -r92f7cf45960398664518966bfaa2199f287cf2bd
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 30f049651877229042e3f8700c8596e5b9a1e0f4)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 92f7cf45960398664518966bfaa2199f287cf2bd)
@@ -56,6 +56,8 @@
 #define OCCLUSION_THRESHOLD                 25000                                           ///< Threshold above which an occlusion is detected.
 #define CARTRIDGE_LOADED_THRESHOLD          5000                                            ///< Threshold above which a cartridge is considered loaded.
 
+#define EMPTY_SALINE_BAG_THRESHOLD_MMGH     -200.0                                          ///< Threshold below which the saline bag is considered empty (in mmHg).  TODO - get real threshold from Systems
+
 #define PRES_ALARM_PERSISTENCE              ( 1 * MS_PER_SECOND )                           ///< Alarm persistence period for pressure alarms.
 
 /// Defined states for the pressure and occlusion monitor state machine.
@@ -151,6 +153,28 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The isSalineBagEmpty function determines whether the saline bag is empty.
+ * It is assumed that this function will only be called when pumping (BP) from
+ * the saline bag.  Determination is based on pressure going below a negative
+ * threshold.
+ * @details Inputs: arterial line pressure
+ * @details Outputs: none
+ * @return TRUE if arterial line pressure is below threshold, FALSE if not.
+ *************************************************************************/
+BOOL isSalineBagEmpty( void )
+{
+    BOOL result = FALSE;
+
+    if ( getMeasuredArterialPressure() < EMPTY_SALINE_BAG_THRESHOLD_MMGH )
+    {
+        result = TRUE;
+    }
+
+    return result;
+}
+
 /*********************************************************************//**
  * @brief
  * The execPresOccl function executes the pressure and occlusion monitor.
Index: firmware/App/Controllers/PresOccl.h
===================================================================
diff -u -r30f049651877229042e3f8700c8596e5b9a1e0f4 -r92f7cf45960398664518966bfaa2199f287cf2bd
--- firmware/App/Controllers/PresOccl.h	(.../PresOccl.h)	(revision 30f049651877229042e3f8700c8596e5b9a1e0f4)
+++ firmware/App/Controllers/PresOccl.h	(.../PresOccl.h)	(revision 92f7cf45960398664518966bfaa2199f287cf2bd)
@@ -72,6 +72,7 @@
 U32  getMeasuredDialOutPumpOcclusion( void );
 
 BOOL isCartridgeLoaded( void );
+BOOL isSalineBagEmpty( void );
 
 BOOL testSetPresOcclDataPublishIntervalOverride( U32 value );
 BOOL testResetPresOcclDataPublishIntervalOverride( void );
Index: firmware/App/HDCommon.h
===================================================================
diff -u -r778f343622819491cf644dab36f3194709ce1e95 -r92f7cf45960398664518966bfaa2199f287cf2bd
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 778f343622819491cf644dab36f3194709ce1e95)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 92f7cf45960398664518966bfaa2199f287cf2bd)
@@ -41,17 +41,17 @@
     #define DISABLE_AIR_TRAP_LEVELING       1           // Disable air trap level control
 //    #define DISABLE_3WAY_VALVES             1           // Disable 3-way valves
 //    #define TST_3WAY_VALVES_ALWAYS_OPEN     1           // After POST and homing, open all 4 valves
-    #define DISABLE_ACCELS                  1           // Disable accelerometer POST and monitoring
-    #define DISABLE_CRC_ERROR               1           // Do not error on bad CRC for CAN messages
-    #define DISABLE_ACK_ERRORS              1           // Do not error on failure of other node(s) to ACK a message
-    #define DISABLE_MOTOR_CURRENT_CHECKS    1           // Do not error on HD pump current checks
-    #define DISABLE_PUMP_FLOW_CHECKS        1           // Do not error on HD pump flow checks
-    #define DISABLE_PUMP_SPEED_CHECKS       1           // Do not error on HD pump speed checks
-    #define DISABLE_PUMP_DIRECTION_CHECKS   1           // Do not error on HD pump direction checks
-    #define DISABLE_SALINE_BOLUS_CHECKS     1           // Do not error on HD saline bolus checks
-    #define DISABLE_PRESSURE_CHECKS         1           // Do not error on HD pressure checks
-    #define DISABLE_UF_ALARMS               1           // Do not error on HD ultrafiltration checks
-    #define DISABLE_VALVE_ALARMS            1           // Do not error on HD valve position
+//    #define DISABLE_ACCELS                  1           // Disable accelerometer POST and monitoring
+//    #define DISABLE_CRC_ERROR               1           // Do not error on bad CRC for CAN messages
+//    #define DISABLE_ACK_ERRORS              1           // Do not error on failure of other node(s) to ACK a message
+//    #define DISABLE_MOTOR_CURRENT_CHECKS    1           // Do not error on HD pump current checks
+//    #define DISABLE_PUMP_FLOW_CHECKS        1           // Do not error on HD pump flow checks
+//    #define DISABLE_PUMP_SPEED_CHECKS       1           // Do not error on HD pump speed checks
+//    #define DISABLE_PUMP_DIRECTION_CHECKS   1           // Do not error on HD pump direction checks
+//    #define DISABLE_SALINE_BOLUS_CHECKS     1           // Do not error on HD saline bolus checks
+//    #define DISABLE_PRESSURE_CHECKS         1           // Do not error on HD pressure checks
+//    #define DISABLE_UF_ALARMS               1           // Do not error on HD ultrafiltration checks
+//    #define DISABLE_VALVE_ALARMS            1           // Do not error on HD valve position
 //    #define RUN_PUMPS_OPEN_LOOP             1           // BP and DPi pumps will be run open loop (no flow sensor feedback)
 //    #define RAW_FLOW_SENSOR_DATA            1           // Test build will not filter flow sensor data
 //    #define READ_FPGA_ASYNC_DATA            1           // Test build reads non-priority register page every other time
Index: firmware/App/Modes/Dialysis.c
===================================================================
diff -u -r766708fceb0bdf1af8c7897df29d4f5036bfd3db -r92f7cf45960398664518966bfaa2199f287cf2bd
--- firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision 766708fceb0bdf1af8c7897df29d4f5036bfd3db)
+++ firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision 92f7cf45960398664518966bfaa2199f287cf2bd)
@@ -936,10 +936,10 @@
     bolusSalineVolumeDelivered_Safety = ( (F32)bolusSalineMotorCount * VOLUME_PER_BP_MOTOR_REV_ML );  // TODO - include upstream pressure compensation to this calc
 
 #ifndef DISABLE_SALINE_BOLUS_CHECKS
-    // TODO - check for empty saline bag
-    if ( 0 )
+    // Check for empty saline bag per arterial line pressure   TODO - need persistence?
+    if ( TRUE == isSalineBagEmpty() )
     {
-        SET_ALARM_WITH_1_F32_DATA( ALARM_ID_EMPTY_SALINE_BAG, 0.0 );  // TODO - give data supporting empty bag detection
+        SET_ALARM_WITH_1_F32_DATA( ALARM_ID_EMPTY_SALINE_BAG, getMeasuredArterialPressure() );
         errorFound = TRUE;
     }
 #endif