Index: firmware/App/Modes/ModeTreatment.h
===================================================================
diff -u -ra7104162b3467a67c5f4ed2f0f2ec038a8738d33 -r521a0569bf3097e9f7075d9c0e99dca9af3e6410
--- firmware/App/Modes/ModeTreatment.h	(.../ModeTreatment.h)	(revision a7104162b3467a67c5f4ed2f0f2ec038a8738d33)
+++ firmware/App/Modes/ModeTreatment.h	(.../ModeTreatment.h)	(revision 521a0569bf3097e9f7075d9c0e99dca9af3e6410)
@@ -22,12 +22,31 @@
 
 // ********** public definitions **********
 
+/// Sub-mode states while in treatment mode
+typedef enum Treatment_States
+{
+    TREATMENT_START_STATE = 0,              ///< Start treatment, prime blood side with gradual ramp for 1 min. while dialyzer is bypassed.  No dialysis or UF taking place.
+    TREATMENT_DIALYSIS_STATE,               ///< Perform dialysis.  Deliver Heparin as prescribed.  Deliver UF as prescribed.  Handle saline boluses as requested.
+    TREATMENT_STOP_STATE,                   ///< Treatment stopped.  All pumps off.  Dializer bypassed.
+    TREATMENT_RINSEBACK_STATE,              ///< Perform rinseback with saline.  Dialyzer bypassed. Dialysate recirculating.
+    TREATMENT_RINSEBACK_PAUSE_STATE,        ///< Rinseback paused.  Blood pump off.  Dialyzer bypassed.  Dialysate recirculating.
+    TREATMENT_RECIRC_SETUP_STATE,           ///< Rinseback complete.  Blood pump off.  Blood lines closed.  User to disconnect and shunt blood lines.
+    TREATMENT_RECIRC_STATE,                 ///< Recirculate saline and dialysate while patient disconnected.  Blood lines open and shunted.  Dialyzer is bypassed.
+    TREATMENT_RECIRC_PAUSE_STATE,           ///< Recirculate paused.  Blood pump off.  Blood lines closed and shunted.  Dialyzer is bypassed.
+    TREATMENT_RECIRC_STOP_STATE,            ///< Recirculate stopped.  Blood pump off.  Blood lines open.  Waiting for patient to unshunt and connect and resume treatment.
+    TREATMENT_DIALYSIS_END_STATE,           ///< Dialysis has ended.  Blood pump slowed.  Dialyzer is bypassed.  Dialysate is recirculated.  User can rinseback.
+    TREATMENT_END_STATE,                    ///< Treatment has ended.  All pumps off.  Dialyzer is bypassed.  Blood lines are closed.  User to disconnect.
+    NUM_OF_TREATMENT_STATES                 ///< # of treatment states (sub-modes).
+} TREATMENT_STATE_T;
+
 // ********** private function prototypes **********
 
 void initTreatmentMode( void );           // initialize this module
 void transitionToTreatmentMode( void );   // prepares for transition to treatment mode
 void execTreatmentMode( void );           // execute the treatment mode state machine (call from OperationModes)
 
+TREATMENT_STATE_T getTreatmentState( void );
+
 BOOL verifyTreatmentDurationSettingChange( U32 treatmentTime );
 BOOL verifyUFSettingsChange( F32 uFVolume, UF_ADJ_T adjustment );
 BOOL verifyUFSettingsConfirmation( BOOL confirmed, F32 uFVolume, U32 treatmentTime, F32 uFRate );