diff --git a/input/fsh/covid19-inpatient-therapy/17-therapeutic-anticoagulation/recommendation_17_intervention.fsh b/input/fsh/covid19-inpatient-therapy/17-therapeutic-anticoagulation/recommendation_17_intervention.fsh
index b3d87e9e..4d5baf5b 100644
--- a/input/fsh/covid19-inpatient-therapy/17-therapeutic-anticoagulation/recommendation_17_intervention.fsh
+++ b/input/fsh/covid19-inpatient-therapy/17-therapeutic-anticoagulation/recommendation_17_intervention.fsh
@@ -88,7 +88,7 @@ Description: "Therapeutic Anticoagulation Treatment (UFH) for non-intensive care
       * periodUnit = $ucum#d "day"
   * doseAndRate
     * doseRange
-      * low = 0 '[iU]' "IU" // any dose of i.v. UFH
+      * low = 0.00001 '[iU]' "IU" // any dose of i.v. UFH
 
 Instance: TherapeuticAnticoagulationNMHDalteparin1xd
 InstanceOf: drug-administration-action
diff --git a/input/fsh/covid19-inpatient-therapy/18-no-therapeutic-anticoagulation/recommendation_18_intervention.fsh b/input/fsh/covid19-inpatient-therapy/18-no-therapeutic-anticoagulation/recommendation_18_intervention.fsh
index 62f240d8..c899ff55 100644
--- a/input/fsh/covid19-inpatient-therapy/18-no-therapeutic-anticoagulation/recommendation_18_intervention.fsh
+++ b/input/fsh/covid19-inpatient-therapy/18-no-therapeutic-anticoagulation/recommendation_18_intervention.fsh
@@ -88,7 +88,7 @@ Description: "No Therapeutic Anticoagulation Treatment with UFH for non-intensiv
       * periodUnit = $ucum#d "day"
   * doseAndRate
     * doseRange
-      * low = 0 '[iU]' "IU" // any dose of i.v. Argatroban
+      * low = 0.00001 '[iU]' "IU" // any dose of i.v. Argatroban
 * doNotPerform = true
 
 Instance: NoTherapeuticAnticoagulationWDalteparin1xd
@@ -405,7 +405,7 @@ Description: "No Therapeutic Anticoagulation Treatment with Argatroban for non-i
       * periodUnit = $ucum#d "day"
   * doseAndRate
     * doseRange
-      * low = 0 '[iU]' "IU" // any dose of i.v. Argatroban
+      * low = 0.00001 '[iU]' "IU" // any dose of i.v. Argatroban
 * doNotPerform = true
 
 Instance: NoTherapeuticAnticoagulationWTinzaparin