diff --git a/src/eligibility_signposting_api/views/eligibility.py b/src/eligibility_signposting_api/views/eligibility.py
index 07e2e079..e7d2bbbc 100644
--- a/src/eligibility_signposting_api/views/eligibility.py
+++ b/src/eligibility_signposting_api/views/eligibility.py
@@ -7,7 +7,7 @@
 from fhir.resources.R4B.operationoutcome import OperationOutcome, OperationOutcomeIssue
 from fhir.resources.R4B.requestgroup import RequestGroup
 from fhir.resources.R4B.task import Task
-from flask import Blueprint, make_response, request
+from flask import Blueprint, make_response
 from flask.typing import ResponseReturnValue
 from wireup import Injected
 
@@ -19,9 +19,9 @@
 eligibility_blueprint = Blueprint("eligibility", __name__)
 
 
-@eligibility_blueprint.get("/")
-def check_eligibility(eligibility_service: Injected[EligibilityService]) -> ResponseReturnValue:
-    nhs_number = NHSNumber(request.args.get("nhs_number", ""))
+@eligibility_blueprint.get("/", defaults={"nhs_number": ""})
+@eligibility_blueprint.get("/<nhs_number>")
+def check_eligibility(nhs_number: NHSNumber, eligibility_service: Injected[EligibilityService]) -> ResponseReturnValue:
     logger.debug("checking nhs_number %r in %r", nhs_number, eligibility_service, extra={"nhs_number": nhs_number})
     try:
         eligibility_status = eligibility_service.get_eligibility_status(nhs_number)
diff --git a/tests/integration/in_process/test_eligibility_endpoint.py b/tests/integration/in_process/test_eligibility_endpoint.py
index 69790a17..fc17f8d2 100644
--- a/tests/integration/in_process/test_eligibility_endpoint.py
+++ b/tests/integration/in_process/test_eligibility_endpoint.py
@@ -18,7 +18,7 @@ def test_nhs_number_given(
     nhs_number, date_of_birth, postcode = persisted_person
 
     # When
-    response = client.get(f"/eligibility/?nhs_number={nhs_number}")
+    response = client.get(f"/eligibility/{nhs_number}")
 
     # Then
     assert_that(
diff --git a/tests/integration/lambda/test_app_running_as_lambda.py b/tests/integration/lambda/test_app_running_as_lambda.py
index bc653cf3..c904b384 100644
--- a/tests/integration/lambda/test_app_running_as_lambda.py
+++ b/tests/integration/lambda/test_app_running_as_lambda.py
@@ -33,13 +33,18 @@ def test_install_and_call_lambda_flask(
     request_payload = {
         "version": "2.0",
         "routeKey": "GET /",
-        "rawPath": "/eligibility/",
-        "rawQueryString": f"nhs_number={nhs_number}",
+        "rawPath": "/",
+        "rawQueryString": "",
         "headers": {"accept": "application/json", "content-type": "application/json"},
         "requestContext": {
-            "http": {"sourceIp": "192.0.0.1", "method": "GET", "path": "/eligibility/", "protocol": "HTTP/1.1"}
+            "http": {
+                "sourceIp": "192.0.0.1",
+                "method": "GET",
+                "path": f"/eligibility/{nhs_number}",
+                "protocol": "HTTP/1.1",
+            }
         },
-        "queryStringParameters": {"nhs_number": nhs_number},
+        "queryStringParameters": {},
         "body": None,
         "isBase64Encoded": False,
     }
@@ -73,7 +78,7 @@ def test_install_and_call_flask_lambda_over_http(
     nhs_number, date_of_birth, postcode = persisted_person
 
     # When
-    response = httpx.get(str(flask_function_url / "eligibility" / "" % {"nhs_number": nhs_number}))
+    response = httpx.get(str(flask_function_url / "eligibility" / nhs_number))
 
     # Then
     assert_that(
@@ -94,7 +99,7 @@ def test_install_and_call_flask_lambda_with_unknown_nhs_number(
     nhs_number = NHSNumber(f"5{faker.random_int(max=999999999):09d}")
 
     # When
-    response = httpx.get(str(flask_function_url / "eligibility" / "" % {"nhs_number": nhs_number}))
+    response = httpx.get(str(flask_function_url / "eligibility" / nhs_number))
 
     # Then
     assert_that(
diff --git a/tests/unit/views/test_eligibility.py b/tests/unit/views/test_eligibility.py
index 5d8c4c9f..10561790 100644
--- a/tests/unit/views/test_eligibility.py
+++ b/tests/unit/views/test_eligibility.py
@@ -42,7 +42,7 @@ def test_nhs_number_given(app: Flask, client: FlaskClient):
     # Given
     with get_app_container(app).override.service(EligibilityService, new=FakeEligibilityService()):
         # When
-        response = client.get("/eligibility/?nhs_number=12345")
+        response = client.get("/eligibility/12345")
 
         # Then
     assert_that(
@@ -80,7 +80,7 @@ def test_no_nhs_number_given(app: Flask, client: FlaskClient):
 def test_unexpected_error(app: Flask, client: FlaskClient):
     # Given
     with get_app_container(app).override.service(EligibilityService, new=FakeUnexpectedErrorEligibilityService()):
-        response = client.get("/eligibility/?nhs_number=12345")
+        response = client.get("/eligibility/12345")
         assert_that(
             response,
             is_response()