diff --git a/system-test/high-precision-query-tests.ts b/system-test/high-precision-query-tests.ts
new file mode 100644
index 00000000..c260a592
--- /dev/null
+++ b/system-test/high-precision-query-tests.ts
@@ -0,0 +1,112 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import * as assert from 'assert';
+import {describe, it, before} from 'mocha';
+import {BigQuery} from '../src';
+
+describe('High Precision Query System Tests', () => {
+  let bigquery: BigQuery;
+
+  before(function () {
+    bigquery = new BigQuery();
+  });
+
+  const timestampOutputFormats = [
+    undefined,
+    'TIMESTAMP_OUTPUT_FORMAT_UNSPECIFIED',
+    'FLOAT64',
+    'INT64',
+    'ISO8601_STRING',
+  ];
+
+  const useInt64Timestamps = [undefined, true, false];
+
+  timestampOutputFormats.forEach(TOF => {
+    useInt64Timestamps.forEach(UI64 => {
+      const testName = `TOF: ${TOF ?? 'omitted'}, UI64: ${UI64 ?? 'omitted'}`;
+
+      // Logic to determine expected success based on BigQuery API validation:
+      // - FLOAT64 and ISO8601_STRING require useInt64Timestamp to be false.
+      // - INT64 requires useInt64Timestamp to be true (or omitted).
+      // - Default useInt64Timestamp is true.
+      let expectedSuccess = true;
+      const actualUI64 = UI64 ?? true;
+
+      if (TOF === 'FLOAT64' || TOF === 'ISO8601_STRING') {
+        if (actualUI64 === true) {
+          expectedSuccess = false;
+        }
+      } else if (TOF === 'INT64') {
+        if (actualUI64 === false) {
+          expectedSuccess = false;
+        }
+      }
+
+      it(`should handle ${testName}`, async function () {
+        // Use a parameter to avoid potential library bugs with simple query strings
+        // and to ensure we are testing the high-precision path.
+        const query = {
+          query: 'SELECT ? as ts',
+          params: [bigquery.timestamp('2024-07-15 10:00:00.123456789123')],
+        };
+
+        // The library currently expects flattened keys for formatOptions in bigquery.query
+        // to match the underlying API's query parameter names.
+        const options: any = {};
+        if (TOF !== undefined) {
+          options['formatOptions.timestampOutputFormat'] = TOF;
+        }
+        if (UI64 !== undefined) {
+          options['formatOptions.useInt64Timestamp'] = UI64;
+        }
+
+        try {
+          const [rows] = await bigquery.query(query, options);
+          if (!expectedSuccess) {
+            assert.fail(
+              `Query should have failed for ${testName}, but succeeded`
+            );
+          }
+          assert.ok(rows.length > 0);
+          assert.ok(rows[0].ts);
+        } catch (err: any) {
+          // Check for authentication or environment errors
+          const isAuthError =
+            err.message.includes('unauthenticated') ||
+            err.message.includes('permission denied') ||
+            err.message.includes('Could not load the default credentials') ||
+            err.message.includes('Unable to detect a Project Id');
+
+          if (isAuthError) {
+            this.skip();
+          }
+
+          if (expectedSuccess) {
+            throw err;
+          }
+
+          // If expected to fail, it should be a validation error (e.g., 400 Bad Request)
+          const statusCode =
+            err.code || (err.response && err.response.statusCode);
+          assert.strictEqual(
+            statusCode,
+            400,
+            `Expected 400 error for ${testName}, got ${statusCode} (${err.message})`
+          );
+        }
+      });
+    });
+  });
+});