diff --git a/sdk/metric/metricdata/data.go b/sdk/metric/metricdata/data.go
index 897e408c659..ab8b6990271 100644
--- a/sdk/metric/metricdata/data.go
+++ b/sdk/metric/metricdata/data.go
@@ -272,21 +272,21 @@ type SummaryDataPoint struct {
 	Count uint64
 
 	// Sum is the sum of the values recorded.
-	Sum *float64
+	Sum Extrema[float64]
 
 	// (Optional) list of values at different quantiles of the distribution calculated
 	// from the current snapshot. The quantiles must be strictly increasing.
-	QuantileValues []ValueAtQuantile
+	QuantileValues []QuantileValue
 }
 
-// ValueAtQuantile the value at a given quantile of a distribution.
-type ValueAtQuantile struct {
-	// The quantile of a distribution.
+// QuantileValue is the value at a given quantile of a summary.
+type QuantileValue struct {
+	// Quantile is the quantile of this value.
 	//
 	// Must be in the interval [0.0, 1.0].
 	Quantile float64
 
-	// The value at the given quantile of a distribution.
+	// Value is the value at the given quantile of a summary.
 	//
 	// Quantile values must NOT be negative.
 	Value float64
diff --git a/sdk/metric/metricdata/metricdatatest/assertion.go b/sdk/metric/metricdata/metricdatatest/assertion.go
index 56fed69c077..a65fd99f482 100644
--- a/sdk/metric/metricdata/metricdatatest/assertion.go
+++ b/sdk/metric/metricdata/metricdatatest/assertion.go
@@ -49,7 +49,7 @@ type Datatypes interface {
 		metricdata.ExponentialBucket |
 		metricdata.Summary |
 		metricdata.SummaryDataPoint |
-		metricdata.ValueAtQuantile
+		metricdata.QuantileValue
 
 	// Interface types are not allowed in union types, therefore the
 	// Aggregation and Value type from metricdata are not included here.
@@ -184,8 +184,8 @@ func AssertEqual[T Datatypes](t TestingT, expected, actual T, opts ...Option) bo
 		r = equalSummary(e, aIface.(metricdata.Summary), cfg)
 	case metricdata.SummaryDataPoint:
 		r = equalSummaryDataPoint(e, aIface.(metricdata.SummaryDataPoint), cfg)
-	case metricdata.ValueAtQuantile:
-		r = equalValueAtQuantile(e, aIface.(metricdata.ValueAtQuantile), cfg)
+	case metricdata.QuantileValue:
+		r = equalQuantileValue(e, aIface.(metricdata.QuantileValue), cfg)
 	default:
 		// We control all types passed to this, panic to signal developers
 		// early they changed things in an incompatible way.
@@ -264,7 +264,7 @@ func AssertHasAttributes[T Datatypes](t TestingT, actual T, attrs ...attribute.K
 		reasons = hasAttributesSummary(e, attrs...)
 	case metricdata.SummaryDataPoint:
 		reasons = hasAttributesSummaryDataPoint(e, attrs...)
-	case metricdata.ValueAtQuantile:
+	case metricdata.QuantileValue:
 		// Nothing to check.
 	default:
 		// We control all types passed to this, panic to signal developers
diff --git a/sdk/metric/metricdata/metricdatatest/assertion_test.go b/sdk/metric/metricdata/metricdatatest/assertion_test.go
index c9af783255a..bc412e9c3dd 100644
--- a/sdk/metric/metricdata/metricdatatest/assertion_test.go
+++ b/sdk/metric/metricdata/metricdatatest/assertion_test.go
@@ -257,12 +257,12 @@ var (
 		Exemplars:    []metricdata.Exemplar[float64]{exemplarFloat64A},
 	}
 
-	sum            = 3.0
-	quantileValueA = metricdata.ValueAtQuantile{
+	sum            = metricdata.NewExtrema[float64](3)
+	quantileValueA = metricdata.QuantileValue{
 		Quantile: 0.0,
 		Value:    0.1,
 	}
-	quantileValueB = metricdata.ValueAtQuantile{
+	quantileValueB = metricdata.QuantileValue{
 		Quantile: 0.1,
 		Value:    0.2,
 	}
@@ -271,30 +271,30 @@ var (
 		StartTime:      startA,
 		Time:           endA,
 		Count:          2,
-		Sum:            &sum,
-		QuantileValues: []metricdata.ValueAtQuantile{quantileValueA},
+		Sum:            sum,
+		QuantileValues: []metricdata.QuantileValue{quantileValueA},
 	}
 	summaryDataPointB = metricdata.SummaryDataPoint{
 		Attributes:     attrB,
 		StartTime:      startB,
 		Time:           endB,
 		Count:          3,
-		QuantileValues: []metricdata.ValueAtQuantile{quantileValueB},
+		QuantileValues: []metricdata.QuantileValue{quantileValueB},
 	}
 	summaryDataPointC = metricdata.SummaryDataPoint{
 		Attributes:     attrA,
 		StartTime:      startB,
 		Time:           endB,
 		Count:          2,
-		Sum:            &sum,
-		QuantileValues: []metricdata.ValueAtQuantile{quantileValueA},
+		Sum:            sum,
+		QuantileValues: []metricdata.QuantileValue{quantileValueA},
 	}
 	summaryDataPointD = metricdata.SummaryDataPoint{
 		Attributes:     attrA,
 		StartTime:      startA,
 		Time:           endA,
 		Count:          3,
-		QuantileValues: []metricdata.ValueAtQuantile{quantileValueB},
+		QuantileValues: []metricdata.QuantileValue{quantileValueB},
 	}
 
 	exponentialBucket2 = metricdata.ExponentialBucket{
@@ -704,7 +704,7 @@ func TestAssertEqual(t *testing.T) {
 	t.Run("ExponentialBuckets", testDatatype(exponentialBucket2, exponentialBucket3, equalExponentialBuckets))
 	t.Run("Summary", testDatatype(summaryA, summaryB, equalSummary))
 	t.Run("SummaryDataPoint", testDatatype(summaryDataPointA, summaryDataPointB, equalSummaryDataPoint))
-	t.Run("QuantileValues", testDatatype(quantileValueA, quantileValueB, equalValueAtQuantile))
+	t.Run("QuantileValues", testDatatype(quantileValueA, quantileValueB, equalQuantileValue))
 }
 
 func TestAssertEqualIgnoreTime(t *testing.T) {
diff --git a/sdk/metric/metricdata/metricdatatest/comparisons.go b/sdk/metric/metricdata/metricdatatest/comparisons.go
index 362d4ae03c2..a7b4d30f702 100644
--- a/sdk/metric/metricdata/metricdatatest/comparisons.go
+++ b/sdk/metric/metricdata/metricdatatest/comparisons.go
@@ -467,12 +467,12 @@ func equalSummaryDataPoint(a, b metricdata.SummaryDataPoint, cfg config) (reason
 		if a.Count != b.Count {
 			reasons = append(reasons, notEqualStr("Count", a.Count, b.Count))
 		}
-		reasons = append(reasons, equalSummarySum(a.Sum, b.Sum, cfg)...)
+		reasons = append(reasons, equalExtrema[float64](a.Sum, b.Sum, cfg)...)
 		r := compareDiff(diffSlices(
 			a.QuantileValues,
 			a.QuantileValues,
-			func(a, b metricdata.ValueAtQuantile) bool {
-				r := equalValueAtQuantile(a, b, cfg)
+			func(a, b metricdata.QuantileValue) bool {
+				r := equalQuantileValue(a, b, cfg)
 				return len(r) == 0
 			},
 		))
@@ -483,7 +483,7 @@ func equalSummaryDataPoint(a, b metricdata.SummaryDataPoint, cfg config) (reason
 	return reasons
 }
 
-func equalValueAtQuantile(a, b metricdata.ValueAtQuantile, _ config) (reasons []string) {
+func equalQuantileValue(a, b metricdata.QuantileValue, _ config) (reasons []string) {
 	if a.Quantile != b.Quantile {
 		reasons = append(reasons, notEqualStr("Quantile", a.Quantile, b.Quantile))
 	}
@@ -493,13 +493,6 @@ func equalValueAtQuantile(a, b metricdata.ValueAtQuantile, _ config) (reasons []
 	return reasons
 }
 
-func equalSummarySum(a, b *float64, _ config) (reasons []string) {
-	if a != b && ((a == nil || b == nil) || *a != *b) {
-		reasons = append(reasons, notEqualStr("Sum", a, b))
-	}
-	return reasons
-}
-
 func notEqualStr(prefix string, expected, actual interface{}) string {
 	return fmt.Sprintf("%s not equal:\nexpected: %v\nactual: %v", prefix, expected, actual)
 }