diff --git a/data/blood/glucose/glucose.go b/data/blood/glucose/glucose.go
index f91f0d671..e1536ff32 100644
--- a/data/blood/glucose/glucose.go
+++ b/data/blood/glucose/glucose.go
@@ -2,6 +2,7 @@ package glucose
 
 import (
 	"math"
+	"strings"
 
 	"github.com/tidepool-org/platform/pointer"
 )
@@ -82,6 +83,24 @@ func NormalizeValueForUnits(value *float64, units *string) *float64 {
 	return value
 }
 
+func MmolLRounded(value float64, units string) float64 {
+	mmolLValue := 0.0
+	if strings.EqualFold(units, MmolL) {
+		mmolLValue = value
+	} else {
+		normalized := NormalizeValueForUnits(&value, &units)
+		mmolLValue = *normalized
+	}
+	return math.Round(mmolLValue*10) / 10
+}
+
+func MgdLRounded(value float64, units string) int {
+	if strings.EqualFold(units, MmolL) {
+		value *= MmolLToMgdLConversionFactor
+	}
+	return int(math.Round(value))
+}
+
 func ValueRangeForRateUnits(rateUnits *string) (float64, float64) {
 	if rateUnits != nil {
 		switch *rateUnits {
diff --git a/data/blood/glucose/glucose_test.go b/data/blood/glucose/glucose_test.go
index 319940730..f770b32e0 100644
--- a/data/blood/glucose/glucose_test.go
+++ b/data/blood/glucose/glucose_test.go
@@ -218,4 +218,39 @@ var _ = Describe("Glucose", func() {
 			}
 		})
 	})
+
+	Describe("MgdLRounded", func() {
+		It("rounds to 0 decimal places", func() {
+			got := glucose.MgdLRounded(3.0, "mmol/L")
+			Expect(got).To(Equal(54))
+			got = glucose.MgdLRounded(3.9, "mmol/L")
+			Expect(got).To(Equal(70))
+			got = glucose.MgdLRounded(10, "mmol/L")
+			Expect(got).To(Equal(180))
+			got = glucose.MgdLRounded(13.9, "mmol/L")
+			Expect(got).To(Equal(250))
+			got = glucose.MgdLRounded(19.4, "mmol/L")
+			Expect(got).To(Equal(350))
+
+			got = glucose.MgdLRounded(54.49999999999999, "mg/dL")
+			Expect(got).To(Equal(54))
+			got = glucose.MgdLRounded(54.5, "mg/dL")
+			Expect(got).To(Equal(55))
+		})
+	})
+
+	Describe("MmolLRounded", func() {
+		It("rounds to 1 decimal place", func() {
+			got := glucose.MmolLRounded(54, "mg/dL")
+			Expect(got).To(Equal(3.0))
+			got = glucose.MmolLRounded(70, "mg/dL")
+			Expect(got).To(Equal(3.9))
+			got = glucose.MmolLRounded(180, "mg/dL")
+			Expect(got).To(Equal(10.0))
+			got = glucose.MmolLRounded(250, "mg/dL")
+			Expect(got).To(Equal(13.9))
+			got = glucose.MmolLRounded(350, "mg/dL")
+			Expect(got).To(Equal(19.4))
+		})
+	})
 })
diff --git a/summary/types/glucose.go b/summary/types/glucose.go
index 06e9fd1c0..bceee7a1c 100644
--- a/summary/types/glucose.go
+++ b/summary/types/glucose.go
@@ -2,7 +2,6 @@ package types
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"math"
 	"strconv"
@@ -15,6 +14,7 @@ import (
 	"github.com/tidepool-org/platform/data/blood/glucose"
 	"github.com/tidepool-org/platform/data/types/blood/glucose/continuous"
 	"github.com/tidepool-org/platform/data/types/blood/glucose/selfmonitored"
+	"github.com/tidepool-org/platform/errors"
 )
 
 const (
@@ -24,6 +24,8 @@ const (
 
 type Glucose interface {
 	NormalizedValue() float64
+	Value() float64
+	Units() string
 	Type() string
 	Time() *time.Time
 	CreatedTime() *time.Time
@@ -53,6 +55,20 @@ func (s SelfMonitoredGlucoseAdapter) NormalizedValue() float64 {
 	return *glucose.NormalizeValueForUnits(s.datum.Value, s.datum.Units)
 }
 
+func (s SelfMonitoredGlucoseAdapter) Units() string {
+	if s.datum == nil || s.datum.Units == nil {
+		return ""
+	}
+	return *s.datum.Units
+}
+
+func (s SelfMonitoredGlucoseAdapter) Value() float64 {
+	if s.datum == nil || s.datum.Value == nil {
+		return 0
+	}
+	return *s.datum.Value
+}
+
 func (s SelfMonitoredGlucoseAdapter) Type() string {
 	return s.datum.GetType()
 }
@@ -79,6 +95,20 @@ func (c ContinuousGlucoseAdapter) NormalizedValue() float64 {
 	return *glucose.NormalizeValueForUnits(c.datum.Value, c.datum.Units)
 }
 
+func (c ContinuousGlucoseAdapter) Units() string {
+	if c.datum == nil || c.datum.Units == nil {
+		return ""
+	}
+	return *c.datum.Units
+}
+
+func (c ContinuousGlucoseAdapter) Value() float64 {
+	if c.datum == nil || c.datum.Value == nil {
+		return 0
+	}
+	return *c.datum.Value
+}
+
 func (c ContinuousGlucoseAdapter) Type() string {
 	return c.datum.GetType()
 }
@@ -262,24 +292,38 @@ func (rs *GlucoseRanges) Finalize(days int) {
 	}
 }
 
-func (rs *GlucoseRanges) Update(record Glucose) {
-	normalizedValue := record.NormalizedValue()
+const (
+	veryLowBloodGlucoseMgdL     int = 54
+	lowBloodGlucoseMgdL         int = 70
+	highBloodGlucoseMgdL        int = 180
+	veryHighBloodGlucoseMgdL    int = 250
+	extremeHighBloodGlucoseMgdL int = 350
+)
 
-	if normalizedValue < veryLowBloodGlucose {
+var (
+	veryLowBloodGlucose  = glucose.MmolLRounded(float64(veryLowBloodGlucoseMgdL), glucose.MmolL)
+	lowBloodGlucose      = glucose.MmolLRounded(float64(lowBloodGlucoseMgdL), glucose.MmolL)
+	highBloodGlucose     = glucose.MmolLRounded(float64(highBloodGlucoseMgdL), glucose.MmolL)
+	veryHighBloodGlucose = glucose.MmolLRounded(float64(veryHighBloodGlucoseMgdL), glucose.MmolL)
+)
+
+func (rs *GlucoseRanges) Update(record Glucose) {
+	mgdLRounded := glucose.MgdLRounded(record.Value(), record.Units())
+	if mgdLRounded < veryLowBloodGlucoseMgdL {
 		rs.VeryLow.Update(record)
 		rs.AnyLow.Update(record)
-	} else if normalizedValue > veryHighBloodGlucose {
+	} else if mgdLRounded > veryHighBloodGlucoseMgdL {
 		rs.VeryHigh.Update(record)
 		rs.AnyHigh.Update(record)
 
 		// VeryHigh is inclusive of extreme high, this is intentional
-		if normalizedValue >= extremeHighBloodGlucose {
+		if mgdLRounded >= extremeHighBloodGlucoseMgdL {
 			rs.ExtremeHigh.Update(record)
 		}
-	} else if normalizedValue < lowBloodGlucose {
+	} else if mgdLRounded < lowBloodGlucoseMgdL {
 		rs.Low.Update(record)
 		rs.AnyLow.Update(record)
-	} else if normalizedValue > highBloodGlucose {
+	} else if mgdLRounded > highBloodGlucoseMgdL {
 		rs.AnyHigh.Update(record)
 		rs.High.Update(record)
 	} else {
diff --git a/summary/types/summary.go b/summary/types/summary.go
index 4e4f3bd39..f99486447 100644
--- a/summary/types/summary.go
+++ b/summary/types/summary.go
@@ -20,12 +20,7 @@ const (
 	SummaryTypeContinuous = "con"
 	SchemaVersion         = 6
 
-	lowBloodGlucose         = 3.9
-	veryLowBloodGlucose     = 3.0
-	highBloodGlucose        = 10.0
-	veryHighBloodGlucose    = 13.9
-	extremeHighBloodGlucose = 19.4
-	HoursAgoToKeep          = 60 * 24
+	HoursAgoToKeep = 60 * 24
 
 	OutdatedReasonUploadCompleted = "UPLOAD_COMPLETED"
 	OutdatedReasonDataAdded       = "DATA_ADDED"