Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r61716bc97ecca8af1ec560333844a8cf602eccb0 -rcf0f5e54c1a7af4d8a739cbd677d899d95e4019b
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 61716bc97ecca8af1ec560333844a8cf602eccb0)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision cf0f5e54c1a7af4d8a739cbd677d899d95e4019b)
@@ -474,6 +474,13 @@
         F32 artLowLimit  = (F32)getTreatmentParameterS32( TREATMENT_PARAM_ART_PRESSURE_LOW_LIMIT );
         F32 artHighLimit = (F32)getTreatmentParameterS32( TREATMENT_PARAM_ART_PRESSURE_HIGH_LIMIT );
 
+        // If BP is ramping up, extend range to outer limits as pressure may not yet have reached expected range.
+        if ( isBloodPumpRampComplete() != TRUE )
+        {
+            artLowLimit = (F32)getS32TreatmentParamLowerRangeLimit( TREATMENT_PARAM_ART_PRESSURE_LOW_LIMIT );
+            artHighLimit = (F32)getS32TreatmentParamUpperRangeLimit( TREATMENT_PARAM_ART_PRESSURE_HIGH_LIMIT );
+        }
+
         // Check arterial pressure is within user set alarm limits
         if ( TRUE == isPersistentAlarmTriggered( ALARM_ID_ARTERIAL_PRESSURE_LOW, artPres < artLowLimit ) )
         {
@@ -519,6 +526,13 @@
         F32 venLowLimit  = (F32)getTreatmentParameterS32( TREATMENT_PARAM_VEN_PRESSURE_LOW_LIMIT );
         F32 venHighLimit = (F32)getTreatmentParameterS32( TREATMENT_PARAM_VEN_PRESSURE_HIGH_LIMIT );
 
+        // If BP is ramping up, extend range to outer limits as pressure may not yet have reached expected range.
+        if ( isBloodPumpRampComplete() != TRUE )
+        {
+            venLowLimit = (F32)getS32TreatmentParamLowerRangeLimit( TREATMENT_PARAM_VEN_PRESSURE_LOW_LIMIT );
+            venHighLimit = (F32)getS32TreatmentParamUpperRangeLimit( TREATMENT_PARAM_VEN_PRESSURE_HIGH_LIMIT );
+        }
+
         // Cannot monitor for low venous pressure while venting air trap
         if ( getValveAirTrapStatus() != STATE_OPEN )
         {