diff --git a/addons/medical/functions/fnc_getBloodLoss.sqf b/addons/medical/functions/fnc_getBloodLoss.sqf
index a7e6ae15b8..1a7e3968d8 100644
--- a/addons/medical/functions/fnc_getBloodLoss.sqf
+++ b/addons/medical/functions/fnc_getBloodLoss.sqf
@@ -30,4 +30,4 @@ private _tourniquets = _unit getVariable [QGVAR(tourniquets), [0,0,0,0,0,0]];
     _totalBloodLoss = _totalBloodLoss + ((_x select 4) * (_x select 3));
 } forEach (_unit getVariable [QGVAR(internalWounds), []]);
 
-_totalBloodLoss * ((_unit getVariable [QGVAR(bleedingCoefficient), GVAR(bleedingCoefficient)]) max 0);
+_totalBloodLoss * ((_unit getVariable [QGVAR(bleedingCoefficient), GVAR(bleedingCoefficient)]) max 0) * DEFAULT_BLOOD_VOLUME / 100;
diff --git a/addons/medical/functions/fnc_getBloodVolumeChange.sqf b/addons/medical/functions/fnc_getBloodVolumeChange.sqf
index 396d058140..17b80f2f99 100644
--- a/addons/medical/functions/fnc_getBloodVolumeChange.sqf
+++ b/addons/medical/functions/fnc_getBloodVolumeChange.sqf
@@ -23,7 +23,7 @@
 
 params ["_unit", "_syncValues"];
 
-private _bloodVolume = _unit getVariable [QGVAR(bloodVolume), 100];
+private _bloodVolume = _unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME];
 private _bloodVolumeChange = -([_unit] call FUNC(getBloodLoss));
 
 if (!isNil {_unit getVariable QGVAR(ivBags)}) then {
@@ -33,7 +33,7 @@ if (!isNil {_unit getVariable QGVAR(ivBags)}) then {
             _x params ["_bagVolumeRemaining"];
             private _bagChange = IV_CHANGE_PER_SECOND min _bagVolumeRemaining; // absolute value of the change in miliLiters
             _bagVolumeRemaining = _bagVolumeRemaining - _bagChange;
-            _bloodVolumeChange = _bloodVolumeChange + (_bagChange / 70); // ((bag change in ml) / (body total:7000ml)) out of 100 percent
+            _bloodVolumeChange = _bloodVolumeChange + _bagChange;
             if (_bagVolumeRemaining < 0.01) then {
                 []
             } else {
diff --git a/addons/medical/functions/fnc_getCardiacOutput.sqf b/addons/medical/functions/fnc_getCardiacOutput.sqf
index 74da98012b..9515d2cafe 100644
--- a/addons/medical/functions/fnc_getCardiacOutput.sqf
+++ b/addons/medical/functions/fnc_getCardiacOutput.sqf
@@ -24,4 +24,4 @@
 
 params ["_unit"];
 
-((_unit getVariable [QGVAR(bloodVolume), 100])/MODIFIER_CARDIAC_OUTPUT) + ((_unit getVariable [QGVAR(heartRate), 80])/80-1);
+((_unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME]) / MODIFIER_CARDIAC_OUTPUT) + ((_unit getVariable [QGVAR(heartRate), 80]) / 80 - 1);
diff --git a/addons/medical/functions/fnc_getHeartRateChange.sqf b/addons/medical/functions/fnc_getHeartRateChange.sqf
index 4f0b19f80c..7476a088c9 100644
--- a/addons/medical/functions/fnc_getHeartRateChange.sqf
+++ b/addons/medical/functions/fnc_getHeartRateChange.sqf
@@ -49,7 +49,7 @@ if (!(_unit getVariable [QGVAR(inCardiacArrest),false])) then {
     _adjustment = _adjustment - [ObjNull];
     _unit setVariable [QGVAR(heartRateAdjustments), _adjustment];
 
-    private _bloodVolume = _unit getVariable [QGVAR(bloodVolume), 100];
+    private _bloodVolume = _unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME];
     if (_bloodVolume > 75) then {
         if (_bloodLoss > 0.0) then {
             if (_bloodLoss < 0.5) then {
diff --git a/addons/medical/functions/fnc_handleStateDefault.sqf b/addons/medical/functions/fnc_handleStateDefault.sqf
index 5339268054..c94add2798 100644
--- a/addons/medical/functions/fnc_handleStateDefault.sqf
+++ b/addons/medical/functions/fnc_handleStateDefault.sqf
@@ -13,7 +13,7 @@ if (!local _unit) exitWith {
         _unit setVariable [QGVAR(heartRate), _unit getVariable [QGVAR(heartRate), 80], true];
         _unit setVariable [QGVAR(bloodPressure), _unit getVariable [QGVAR(bloodPressure), [80, 120]], true];
     };
-    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), 100], true];
+    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME], true];
 };
 
 systemChat format["handling state default for unit: %1", _this];
diff --git a/addons/medical/functions/fnc_handleStateInjured.sqf b/addons/medical/functions/fnc_handleStateInjured.sqf
index 9f104498c6..3e81bd29cd 100644
--- a/addons/medical/functions/fnc_handleStateInjured.sqf
+++ b/addons/medical/functions/fnc_handleStateInjured.sqf
@@ -13,7 +13,7 @@ if (!local _unit) exitWith {
         _unit setVariable [QGVAR(heartRate), _unit getVariable [QGVAR(heartRate), 80], true];
         _unit setVariable [QGVAR(bloodPressure), _unit getVariable [QGVAR(bloodPressure), [80, 120]], true];
     };
-    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), 100], true];
+    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME], true];
 };
 
 [_unit, CBA_missionTime - _lastTime] call FUNC(handleUnitVitals);
diff --git a/addons/medical/functions/fnc_handleStateRevive.sqf b/addons/medical/functions/fnc_handleStateRevive.sqf
index 45abbd2ed4..e5251c93e5 100644
--- a/addons/medical/functions/fnc_handleStateRevive.sqf
+++ b/addons/medical/functions/fnc_handleStateRevive.sqf
@@ -12,7 +12,7 @@ if (!local _unit) exitWith {
         _unit setVariable [QGVAR(heartRate), _unit getVariable [QGVAR(heartRate), 80], true];
         _unit setVariable [QGVAR(bloodPressure), _unit getVariable [QGVAR(bloodPressure), [80, 120]], true];
     };
-    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), 100], true];
+    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME], true];
 };
 
 private _startTime = _unit getVariable [QGVAR(reviveStartTime), 0];
diff --git a/addons/medical/functions/fnc_handleStateUnconscious.sqf b/addons/medical/functions/fnc_handleStateUnconscious.sqf
index 9f104498c6..3e81bd29cd 100644
--- a/addons/medical/functions/fnc_handleStateUnconscious.sqf
+++ b/addons/medical/functions/fnc_handleStateUnconscious.sqf
@@ -13,7 +13,7 @@ if (!local _unit) exitWith {
         _unit setVariable [QGVAR(heartRate), _unit getVariable [QGVAR(heartRate), 80], true];
         _unit setVariable [QGVAR(bloodPressure), _unit getVariable [QGVAR(bloodPressure), [80, 120]], true];
     };
-    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), 100], true];
+    _unit setVariable [QGVAR(bloodVolume), _unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME], true];
 };
 
 [_unit, CBA_missionTime - _lastTime] call FUNC(handleUnitVitals);
diff --git a/addons/medical/functions/fnc_handleUnitVitals.sqf b/addons/medical/functions/fnc_handleUnitVitals.sqf
index b7d3e2496a..b01b1d9aee 100644
--- a/addons/medical/functions/fnc_handleUnitVitals.sqf
+++ b/addons/medical/functions/fnc_handleUnitVitals.sqf
@@ -10,7 +10,6 @@
  *
  * Public: No
  */
-
 #include "script_component.hpp"
 
 params ["_unit", "_interval"];
@@ -23,27 +22,24 @@ if (_syncValues) then {
     _unit setVariable [QGVAR(lastMomentValuesSynced), CBA_missionTime];
 };
 
-private _bloodVolume = (_unit getVariable [QGVAR(bloodVolume), 100]) + ([_unit, _syncValues] call FUNC(getBloodVolumeChange));
+private _bloodVolume = (_unit getVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME]) + ([_unit, _syncValues] call FUNC(getBloodVolumeChange));
 _bloodVolume = _bloodVolume max 0;
 
 _unit setVariable  [QGVAR(bloodVolume), _bloodVolume, _syncValues];
 
 TRACE_3("ACE_DEBUG",_bloodVolume,_syncValues,_unit);
 // Set variables for synchronizing information across the net
-if (_bloodVolume < 100) then {
-    if (_bloodVolume < 90) then {
-        TRACE_4("ACE_DEBUG",_bloodVolume,_unit getVariable QGVAR(hasLostBlood),_syncValues,_unit);
+if (_bloodVolume < DEFAULT_BLOOD_VOLUME - HAS_LOST_SOME_BLOOD_THRESHOLD) then {
+    if (_bloodVolume < DEFAULT_BLOOD_VOLUME - HAS_LOST_MUCH_BLOOD_THRESHOLD) then {
         if (_unit getVariable [QGVAR(hasLostBlood), 0] != 2) then {
             _unit setVariable [QGVAR(hasLostBlood), 2, true];
         };
     } else {
-        TRACE_4("ACE_DEBUG", _bloodVolume,_unit getVariable QGVAR(hasLostBlood),_syncValues,_unit);
         if (_unit getVariable [QGVAR(hasLostBlood), 0] != 1) then {
             _unit setVariable [QGVAR(hasLostBlood), 1, true];
         };
     };
 } else {
-    TRACE_4("ACE_DEBUG",_bloodVolume,_unit getVariable QGVAR(hasLostBlood),_syncValues,_unit);
     if (_unit getVariable [QGVAR(hasLostBlood), 0] != 0) then {
         _unit setVariable [QGVAR(hasLostBlood), 0, true];
     };
diff --git a/addons/medical/functions/fnc_init.sqf b/addons/medical/functions/fnc_init.sqf
index 516879ad31..192ccc5fcb 100644
--- a/addons/medical/functions/fnc_init.sqf
+++ b/addons/medical/functions/fnc_init.sqf
@@ -19,7 +19,7 @@ if (damage _unit > 0) then {
 };
 
 _unit setVariable [QGVAR(pain), 0, true];
-_unit setVariable [QGVAR(bloodVolume), 100, true];
+_unit setVariable [QGVAR(bloodVolume), DEFAULT_BLOOD_VOLUME, true];
 _unit setVariable ["ACE_isUnconscious", false, true]; // TODO this is done based on state
 
 // tourniquets
diff --git a/addons/medical/script_macros_medical.hpp b/addons/medical/script_macros_medical.hpp
index db1872207f..907b47c2f1 100644
--- a/addons/medical/script_macros_medical.hpp
+++ b/addons/medical/script_macros_medical.hpp
@@ -14,3 +14,9 @@
 #define GET_NUMBER(config,default) (if (isNumber (config)) then {getNumber (config)} else {default})
 #define GET_STRING(config,default) (if (isText (config)) then {getText (config)} else {default})
 #define GET_ARRAY(config,default) (if (isArray (config)) then {getArray (config)} else {default})
+
+// --- blood
+#define DEFAULT_BLOOD_VOLUME 6.0 // in liters
+
+#define HAS_LOST_SOME_BLOOD_THRESHOLD 0.100 // in liters
+#define HAS_LOST_MUCH_BLOOD_THRESHOLD 0.500 // in liters
diff --git a/addons/medical_treatment/functions/fnc_treatmentBloodbagLocal.sqf b/addons/medical_treatment/functions/fnc_treatmentBloodbagLocal.sqf
index 144e386f3a..af725adadb 100644
--- a/addons/medical_treatment/functions/fnc_treatmentBloodbagLocal.sqf
+++ b/addons/medical_treatment/functions/fnc_treatmentBloodbagLocal.sqf
@@ -23,5 +23,5 @@ private _bloodAdded = switch (true) do {
     default {BLOODBAGHEAL};
 };
 
-private _blood = ((_target getVariable [QEGVAR(medical,bloodVolume), 100]) + _bloodAdded) min 100;
+private _blood = ((_target getVariable [QEGVAR(medical,bloodVolume), DEFAULT_BLOOD_VOLUME]) + _bloodAdded) min DEFAULT_BLOOD_VOLUME;
 _target setVariable [QEGVAR(medical,bloodVolume), _blood, true];
diff --git a/addons/medical_treatment/functions/fnc_treatmentFullHealLocal.sqf b/addons/medical_treatment/functions/fnc_treatmentFullHealLocal.sqf
index b177e026b9..34749ff421 100644
--- a/addons/medical_treatment/functions/fnc_treatmentFullHealLocal.sqf
+++ b/addons/medical_treatment/functions/fnc_treatmentFullHealLocal.sqf
@@ -18,7 +18,7 @@ params ["_caller", "_target"];
 if (alive _target) exitWith {
     _target setVariable [QEGVAR(medical,pain), 0, true];
     _target setVariable [QEGVAR(medical,morphine), 0, true];
-    _target setVariable [QEGVAR(medical,bloodVolume), 100, true];
+    _target setVariable [QEGVAR(medical,bloodVolume), DEFAULT_BLOOD_VOLUME, true];
 
     // tourniquets
     _target setVariable [QEGVAR(medical,tourniquets), [0,0,0,0,0,0], true];
diff --git a/addons/medical_treatment/functions/fnc_treatmentIVLocal.sqf b/addons/medical_treatment/functions/fnc_treatmentIVLocal.sqf
index 2e2687b7d1..6324abd126 100644
--- a/addons/medical_treatment/functions/fnc_treatmentIVLocal.sqf
+++ b/addons/medical_treatment/functions/fnc_treatmentIVLocal.sqf
@@ -17,9 +17,9 @@
 
 params ["_target", "_treatmentClassname"];
 
-private _bloodVolume = _target getVariable [QEGVAR(medical,bloodVolume), 100];
+private _bloodVolume = _target getVariable [QEGVAR(medical,bloodVolume), DEFAULT_BLOOD_VOLUME];
 
-if (_bloodVolume >= 100) exitWith {};
+if (_bloodVolume >= DEFAULT_BLOOD_VOLUME) exitWith {};
 
 // Find the proper attributes for the used IV
 private _config = (configFile >> "ace_medical_treatment" >> "IV");