diff --git a/pkg/tsdb/testdatasource/scenarios.go b/pkg/tsdb/testdatasource/scenarios.go
index 308132acc87..f02a218fe39 100644
--- a/pkg/tsdb/testdatasource/scenarios.go
+++ b/pkg/tsdb/testdatasource/scenarios.go
@@ -334,14 +334,15 @@ func csvToFieldValues(stringInput string) (*data.Field, error) {
 		return nil, fmt.Errorf("csv must have at least one value")
 	}
 
-	first := parts[0]
-	if first == "T" || first == "F" {
+	first := strings.ToUpper(parts[0])
+	if first == "T" || first == "F" || first == "TRUE" || first == "FALSE" {
 		field := data.NewFieldFromFieldType(data.FieldTypeNullableBool, len(parts))
 		for idx, strVal := range parts {
-			if strVal == "null" || strVal == "" {
+			strVal = strings.ToUpper(strVal)
+			if strVal == "NULL" || strVal == "" {
 				continue
 			}
-			field.SetConcrete(idx, strVal == "T")
+			field.SetConcrete(idx, strVal == "T" || strVal == "TRUE")
 		}
 		return field, nil
 	}
diff --git a/pkg/tsdb/testdatasource/scenarios_test.go b/pkg/tsdb/testdatasource/scenarios_test.go
index 591a00128d8..5e32273fbd0 100644
--- a/pkg/tsdb/testdatasource/scenarios_test.go
+++ b/pkg/tsdb/testdatasource/scenarios_test.go
@@ -268,13 +268,16 @@ func TestReadCSV(t *testing.T) {
 	fBool, err := csvToFieldValues("T, F,F,T  ,")
 	require.NoError(t, err)
 
+	fBool2, err := csvToFieldValues("true,false,T,F,F")
+	require.NoError(t, err)
+
 	fNum, err := csvToFieldValues("1,2,,4,5")
 	require.NoError(t, err)
 
 	fStr, err := csvToFieldValues("a,b,,,c")
 	require.NoError(t, err)
 
-	frame := data.NewFrame("", fBool, fNum, fStr)
+	frame := data.NewFrame("", fBool, fBool2, fNum, fStr)
 	out, err := data.FrameToJSON(frame, true, true)
 	require.NoError(t, err)
 
@@ -282,12 +285,14 @@ func TestReadCSV(t *testing.T) {
 
 	require.JSONEq(t, `{"schema":{
 		"fields":[
+			{"type":"boolean","typeInfo":{"frame":"bool","nullable":true}},
 			{"type":"boolean","typeInfo":{"frame":"bool","nullable":true}},
 			{"type":"number","typeInfo":{"frame":"float64","nullable":true}},
 			{"type":"string","typeInfo":{"frame":"string","nullable":true}}
 		]},"data":{
 			"values":[
 				[true,false,false,true,null],
+				[true,false,true,false,false],
 				[1,2,null,4,5],
 				["a","b",null,null,"c"]
 		]}}`, string(out))