Index: firmware/App/Monitors/Pressures.c
===================================================================
diff -u -reef41b7363d82763095a1317f1757f360f0d9ec1 -r8e5105d7e059711084c0d30041cde756d995d62f
--- firmware/App/Monitors/Pressures.c	(.../Pressures.c)	(revision eef41b7363d82763095a1317f1757f360f0d9ec1)
+++ firmware/App/Monitors/Pressures.c	(.../Pressures.c)	(revision 8e5105d7e059711084c0d30041cde756d995d62f)
@@ -101,10 +101,12 @@
 #define SIZE_OF_LONG_ART_ROLLING_AVG        ( ( MS_PER_SECOND / TASK_GENERAL_INTERVAL ) * 10 )
 /// Measured arterial pressure is filtered w/ 1 second moving average for inline pressure.
 #define SIZE_OF_SHORT_ART_ROLLING_AVG       ( ( MS_PER_SECOND / TASK_GENERAL_INTERVAL ) * 1 )
-/// Measured arterial pressure is filtered w/ 10 second moving average for pressure compensation of flow.
+/// Measured venous pressure is filtered w/ 10 second moving average for pressure compensation of flow.
 #define SIZE_OF_LONG_VEN_ROLLING_AVG        ( ( MS_PER_SECOND / TASK_GENERAL_INTERVAL ) * 10 )
 /// Measured venous pressure is filtered w/ 1 second moving average for inline pressure and unfiltered for occlusion detection.
 #define SIZE_OF_SHORT_VEN_ROLLING_AVG       ( ( MS_PER_SECOND / TASK_GENERAL_INTERVAL ) * 1 )
+/// Measured trans-membrane pressure is filtered w/ 10 second moving average for pressure compensation of flow.
+#define SIZE_OF_LONG_TMP_ROLLING_AVG        ( ( MS_PER_SECOND / TASK_GENERAL_INTERVAL ) * 10 )
 
 #define DATA_PUBLISH_COUNTER_START_COUNT    5                                               ///< Data publish counter start count.
 
@@ -161,6 +163,7 @@
 static F32 longFilteredVenousPressure;                                          ///< Measured venous pressure after long (10 s) filter (in mmHg).
 static OVERRIDE_F32_T shortFilteredVenousPressure;                              ///< Measured venous pressure after short (1 s) filter (in mmHg).
 static OVERRIDE_F32_T tmpPressure;                                              ///< Calculated trans-membrane pressure (in mmHg).
+static F32 longFilteredTmpPressure;                                             ///< Measured trans-membrane pressure after long (10 s) filter (in mmHg).
 static STABILIZATION_PERIODS_T pressureStabilizeTime;                           ///< Pressure stabilization time based on system events such as airpump, treatment param changes etc.,
 static BOOL resetFillExemptPeriod;                                              ///< Flag to reset the exempt period after defined time expire.
 static BOOL lowVenousPressureExemptCheck;                                       ///< low venous pressure exempt check flag based on the air trap valve status
@@ -191,6 +194,11 @@
 static U32 venPressureReadingsShortCount;                                       ///< Number of samples in flow rolling average buffer.
 static BARO_MOVING_AVG_DATA_T baroMovingAvg;                                    ///< Barometric sensor moving average.
 
+static F32 tmpPressureReadingsLong[ SIZE_OF_LONG_TMP_ROLLING_AVG ];             ///< Holds flow samples for long trans-membrane pressure rolling average.
+static U32 tmpPressureReadingsLongIdx;                                          ///< Index for next sample in rolling average array.
+static F32 tmpPressureReadingsLongTotal;                                        ///< Rolling total - used to calc average.
+static U32 tmpPressureReadingsLongCount;                                        ///< Number of samples in flow rolling average buffer.
+
 static PRESSURE_SELF_TEST_STATE_T pressurePostState;                            ///< Pressure self test post state.
 //static HD_PRESSURE_SENSORS_CAL_RECORD_T pressureSensorsCalRecord;               ///< Pressure sensors calibration record.
 
@@ -286,6 +294,10 @@
     venPressureReadingsShortTotal                   = 0.0F;
     venPressureReadingsShortCount                   = 0;
 
+    tmpPressureReadingsLongIdx                      = 0;
+    tmpPressureReadingsLongTotal                    = 0.0F;
+    tmpPressureReadingsLongCount                    = 0;
+
     baroMovingAvg.baroAvgPSI.data                   = 0.0F;
     baroMovingAvg.baroAvgPSI.ovData                 = 0.0F;
     baroMovingAvg.baroAvgPSI.ovInitData             = 0.0F;
@@ -584,6 +596,7 @@
 
     // Get latest dialysate pressure so we can calculate TMP
     tmpPressure.data = getFilteredVenousPressure() - ( getDialysatePressure() * PSI_TO_MMHG );
+    tmpPressure.data = getF32OverrideValue( &tmpPressure );
 
     // Handle pressure limits state machine
     execPressureLimits();
@@ -977,6 +990,19 @@
 
 /*********************************************************************//**
  * @brief
+ * The getLongFilteredTMPPressure function gets the current long filtered
+ * trans-membrane pressure.
+ * @details \b Inputs: longFilteredTmpPressure
+ * @details \b Outputs: none
+ * @return the current long filtered trans-membrane pressure (in mmHg).
+ *************************************************************************/
+F32 getLongFilteredTMPPressure( void )
+{
+    return longFilteredTmpPressure;
+}
+
+/*********************************************************************//**
+ * @brief
  * The getBaroPressurePSI function gets the averaged barometric pressure in psi.
  * @details \b Inputs: baroMovingAvg.baroAvgPS
  * @details \b Outputs: none
@@ -1045,6 +1071,18 @@
     venPressureReadingsShortIdx = INC_WRAP( venPressureReadingsShortIdx, 0, SIZE_OF_SHORT_VEN_ROLLING_AVG - 1 );
     venPressureReadingsShortCount = INC_CAP( artPressureReadingsShortCount, SIZE_OF_SHORT_VEN_ROLLING_AVG );
     shortFilteredVenousPressure.data = venPressureReadingsShortTotal / (F32)venPressureReadingsShortCount;
+
+    // Long filter for trans-membrane pressure
+    if ( tmpPressureReadingsLongCount >= SIZE_OF_LONG_VEN_ROLLING_AVG )
+    {
+        tmpPressureReadingsLongTotal -= tmpPressureReadingsLong[ tmpPressureReadingsLongIdx ];
+    }
+    tmpPressureReadingsLong[ tmpPressureReadingsLongIdx ] = tmpPressure.data;
+    tmpPressureReadingsLongTotal += tmpPressure.data;
+    tmpPressureReadingsLongIdx = INC_WRAP( tmpPressureReadingsLongIdx, 0, SIZE_OF_LONG_TMP_ROLLING_AVG - 1 );
+    tmpPressureReadingsLongCount = INC_CAP( tmpPressureReadingsLongCount, SIZE_OF_LONG_TMP_ROLLING_AVG );
+    longFilteredTmpPressure = tmpPressureReadingsLongTotal / (F32)tmpPressureReadingsLongCount;
+
 }
 
 /*********************************************************************//**
Index: firmware/App/Monitors/Pressures.h
===================================================================
diff -u -reef41b7363d82763095a1317f1757f360f0d9ec1 -r8e5105d7e059711084c0d30041cde756d995d62f
--- firmware/App/Monitors/Pressures.h	(.../Pressures.h)	(revision eef41b7363d82763095a1317f1757f360f0d9ec1)
+++ firmware/App/Monitors/Pressures.h	(.../Pressures.h)	(revision 8e5105d7e059711084c0d30041cde756d995d62f)
@@ -92,6 +92,7 @@
 F32 getFilteredVenousPressure( void );
 F32 getLongFilteredVenousPressure( void );
 F32 getTMPPressure( void );
+F32 getLongFilteredTMPPressure( void );
 F32 getBaroPressurePSI( void );
 
 BOOL testPressuresDataPublishIntervalOverride( MESSAGE_T *message );