Index: firmware/App/Modes/SelfTests.c
===================================================================
diff -u -r9a96522e0a94724a13c2c9c8f60cf8d18ebde218 -re1d21390e1143efae91ffec6cccfd3d30950e089
--- firmware/App/Modes/SelfTests.c	(.../SelfTests.c)	(revision 9a96522e0a94724a13c2c9c8f60cf8d18ebde218)
+++ firmware/App/Modes/SelfTests.c	(.../SelfTests.c)	(revision e1d21390e1143efae91ffec6cccfd3d30950e089)
@@ -48,8 +48,8 @@
 #define STABILTY_PRESSURE_SELF_TEST_TIME                    ( 4 * MS_PER_SECOND )                   ///< Time to wait for pressure to stabilize in ms.
 #define DECAY_PRESSURE_SELF_TEST_TIME                       ( 2 * MS_PER_SECOND )                   ///< time to wait for pressure to decay in ms.
 
-#define ARTERIAL_PRESSURE_SELF_TEST_LOW_LIMIT_MMHG          -80.0F                                  ///< Arterial pressure low limit after running blood pump.
-#define VENOUS_PRESSURE_SELF_TEST_HIGH_LIMIT_MMHG            40.0F                                  ///< Venous pressure high limit after running blood pump.
+#define ARTERIAL_PRESSURE_SELF_TEST_LOW_LIMIT_MMHG          -75.0F                                  ///< Arterial pressure low limit after running blood pump.
+#define VENOUS_PRESSURE_SELF_TEST_HIGH_LIMIT_MMHG            35.0F                                  ///< Venous pressure high limit after running blood pump.
 
 #define DECAY_PRESSURE_DIFF_TOLERANCE_MMHG                  5.0F                                    ///< Difference in pressure readings after the pump stops (in mmHg).
 #define STABILITY_PRESSURE_DIFF_TOLERANCE_MMHG              2.0F                                    ///< Difference in pressure readings while in a stable pressured state (in mmHg).
@@ -1027,8 +1027,9 @@
     F32 venousDecayDiff =  0;
 
     // update peak pressure value from pressurized state
-    // if pressure continues to increase due to filter lag
-    if (arterialPressure > peakArterialPressure )
+    // if pressure continues to increase due to filter lag.
+    // Arterial goes negative while Venous goes positive.
+    if (arterialPressure < peakArterialPressure )
     {
         peakArterialPressure = arterialPressure;
     }