Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r6a2571e938b59eaadaa285faa53f1d190adc7d08 -r6dc66bf55bec62b9dcbbde0ed283fe1fdb374f92
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 6a2571e938b59eaadaa285faa53f1d190adc7d08)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 6dc66bf55bec62b9dcbbde0ed283fe1fdb374f92)
@@ -79,6 +79,8 @@
 #define VENOUS_PRESSURE_OCCL_OFFSET_MMHG    ( 50.0F )                                       ///< Venous pressure occlusion threshold offset from max alarm limit (in mmHg).
 #define VENOUS_PRES_AT_FILL_DELAY_MAX_BLOOD_VOL_ML    ( 41.667F )                           ///< Venous pressure low exemption delay after air trap fill maximum blood volume (in mL).
 
+#define MIN_BLOOD_FLOW_FOR_VENOUS_PRES      ( 0.90*MIN_SET_BLOOD_FLOW_RATE )                ///< Minimum blood flow to establish venous pressure in a good range.
+
 /// Venous pressure low exemption period (in task intervals) conversion factor (from Qb in mL/min) following an air trap fill.
 static const U32 VENOUS_PRES_AT_FILL_DELAY_FACTOR = (U32)( VENOUS_PRES_AT_FILL_DELAY_MAX_BLOOD_VOL_ML * (F32)SEC_PER_MIN * ( (F32)MS_PER_SECOND / (F32)TASK_GENERAL_INTERVAL ) );
 
@@ -589,7 +591,7 @@
             break;
 
         case PRESSURE_LIMITS_STATE_IDLE:
-            if ( TRUE == bpRunning )
+            if ( ( TRUE == bpRunning ) && ( getMeasuredBloodFlowRate( ) > MIN_BLOOD_FLOW_FOR_VENOUS_PRES ) )
             {
                 currPresLimitsState = PRESSURE_LIMITS_STATE_WIDE;
             }