diff --git a/experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusSerializer.ts b/experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusSerializer.ts
index 4608562df39..03d6f9a468e 100644
--- a/experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusSerializer.ts
+++ b/experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusSerializer.ts
@@ -184,7 +184,7 @@ export class PrometheusSerializer {
     return str;
   }
 
-  serializeScopeMetrics(scopeMetrics: ScopeMetrics) {
+  private serializeScopeMetrics(scopeMetrics: ScopeMetrics) {
     let str = '';
     for (const metric of scopeMetrics.metrics) {
       str += this.serializeMetricData(metric) + '\n';
@@ -192,7 +192,7 @@ export class PrometheusSerializer {
     return str;
   }
 
-  serializeMetricData(metricData: MetricData) {
+  private serializeMetricData(metricData: MetricData) {
     let name = sanitizePrometheusMetricName(
       escapeString(metricData.descriptor.name)
     );
@@ -236,7 +236,7 @@ export class PrometheusSerializer {
     return `${help}\n${type}\n${results}`.trim();
   }
 
-  serializeSingularDataPoint(name: string, type: InstrumentType, dataPoint: DataPoint<number>): string {
+  private serializeSingularDataPoint(name: string, type: InstrumentType, dataPoint: DataPoint<number>): string {
     let results = '';
 
     name = enforcePrometheusNamingConvention(name, type);
@@ -252,7 +252,7 @@ export class PrometheusSerializer {
     return results;
   }
 
-  serializeHistogramDataPoint(name: string, type: InstrumentType, dataPoint: DataPoint<Histogram>): string {
+  private serializeHistogramDataPoint(name: string, type: InstrumentType, dataPoint: DataPoint<Histogram>): string {
     let results = '';
 
     name = enforcePrometheusNamingConvention(name, type);
diff --git a/experimental/packages/opentelemetry-exporter-prometheus/test/PrometheusSerializer.test.ts b/experimental/packages/opentelemetry-exporter-prometheus/test/PrometheusSerializer.test.ts
index 51733e6386e..7a159436460 100644
--- a/experimental/packages/opentelemetry-exporter-prometheus/test/PrometheusSerializer.test.ts
+++ b/experimental/packages/opentelemetry-exporter-prometheus/test/PrometheusSerializer.test.ts
@@ -48,6 +48,10 @@ class TestMetricReader extends MetricReader {
   async onShutdown() {}
 }
 
+function ignoreComments(result: string): string {
+  return result.split("\n").filter((line) => !line.startsWith('#')).join("\n");
+}
+
 describe('PrometheusSerializer', () => {
   beforeEach(() => {
     mockHrTime();
@@ -86,7 +90,7 @@ describe('PrometheusSerializer', () => {
         const pointData = metric.dataPoints as DataPoint<number>[];
         assert.strictEqual(pointData.length, 1);
 
-        const result = serializer.serializeSingularDataPoint(metric.descriptor.name, metric.descriptor.type, pointData[0]);
+        const result = ignoreComments(serializer.serialize(resourceMetrics));
         return result;
       }
 
@@ -129,7 +133,7 @@ describe('PrometheusSerializer', () => {
         const pointData = metric.dataPoints as DataPoint<Histogram>[];
         assert.strictEqual(pointData.length, 1);
 
-        const result = serializer.serializeHistogramDataPoint(metric.descriptor.name, metric.descriptor.type, pointData[0]);
+        const result = ignoreComments(serializer.serialize(resourceMetrics));
         return result;
       }
 
@@ -182,9 +186,8 @@ describe('PrometheusSerializer', () => {
         assert.strictEqual(errors.length, 0);
         assert.strictEqual(resourceMetrics.scopeMetrics.length, 1);
         assert.strictEqual(resourceMetrics.scopeMetrics[0].metrics.length, 1);
-        const scopeMetrics = resourceMetrics.scopeMetrics[0];
 
-        const result = serializer.serializeScopeMetrics(scopeMetrics);
+        const result = serializer.serialize(resourceMetrics);
         return result;
       }
 
@@ -234,9 +237,8 @@ describe('PrometheusSerializer', () => {
         assert.strictEqual(errors.length, 0);
         assert.strictEqual(resourceMetrics.scopeMetrics.length, 1);
         assert.strictEqual(resourceMetrics.scopeMetrics[0].metrics.length, 1);
-        const scopeMetrics = resourceMetrics.scopeMetrics[0];
 
-        const result = serializer.serializeScopeMetrics(scopeMetrics);
+        const result = serializer.serialize(resourceMetrics);
         return result;
       }
 
@@ -284,7 +286,7 @@ describe('PrometheusSerializer', () => {
       const pointData = metric.dataPoints as DataPoint<number>[];
       assert.strictEqual(pointData.length, 1);
 
-      const result = serializer.serializeSingularDataPoint(metric.descriptor.name, metric.descriptor.type, pointData[0]);
+      const result = ignoreComments(serializer.serialize(resourceMetrics));
       return result;
     }
 
@@ -323,7 +325,7 @@ describe('PrometheusSerializer', () => {
       const pointData = metric.dataPoints as DataPoint<number>[];
       assert.strictEqual(pointData.length, 1);
 
-      const result = serializer.serializeSingularDataPoint(metric.descriptor.name, metric.descriptor.type, pointData[0]);
+      const result = ignoreComments(serializer.serialize(resourceMetrics));
       return result;
     }