diff --git a/tests/integration/test_parser_lab_result_report.py b/tests/integration/test_parser_lab_result_report.py
new file mode 100644
index 00000000..7c47d86d
--- /dev/null
+++ b/tests/integration/test_parser_lab_result_report.py
@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+from openamp_foundry.cli.main import build_parser
+
+
+def test_lab_result_report_parser_defaults_are_stable():
+    parser = build_parser()
+    args = parser.parse_args([
+        "lab-result-report",
+        "--results-dir",
+        "results",
+        "--out-json",
+        "report.json",
+    ])
+
+    assert args.command == "lab-result-report"
+    assert args.results_dir == "results"
+    assert args.out_json == "report.json"
+    assert args.out_md is None