diff --git a/app/Http/Controllers/Api/ConsoleApiController.php b/app/Http/Controllers/Api/ConsoleApiController.php
index 67abbdf..603b515 100644
--- a/app/Http/Controllers/Api/ConsoleApiController.php
+++ b/app/Http/Controllers/Api/ConsoleApiController.php
@@ -87,7 +87,7 @@ class ConsoleApiController extends Controller
             'call_next' => $this->handleCallNext($counter, $validated['queue_uuid'] ?? '', $actor),
             'available' => tap($counter)->update(['status' => 'available']),
             'offline' => tap($counter)->update(['status' => 'offline']),
-            default => $this->handleTicketAction($validated, $actor),
+            default => $this->handleTicketAction($validated, $counter, $actor),
         };
 
         if ($result instanceof Ticket) {
@@ -105,7 +105,7 @@ class ConsoleApiController extends Controller
         return $this->engine->callNext($queue, $counter, $actor);
     }
 
-    protected function handleTicketAction(array $validated, string $actor): Ticket|Counter|null
+    protected function handleTicketAction(array $validated, Counter $counter, string $actor): Ticket|Counter|null
     {
         $ticketUuid = $validated['ticket_uuid'] ?? '';
         abort_if($ticketUuid === '', 422, 'ticket_uuid is required for this action.');
@@ -119,14 +119,28 @@ class ConsoleApiController extends Controller
             'skip' => $this->engine->skip($ticket, $actor),
             'complete' => $this->engine->completeTicket($ticket, $actor),
             'no_show' => $this->engine->markNoShow($ticket, $actor),
-            'transfer' => $this->engine->transfer(
+            'transfer' => $this->handleTransfer(
                 $ticket,
-                ServiceQueue::where('uuid', $validated['to_queue_uuid'] ?? '')->firstOrFail(),
-                null,
+                $counter,
+                $validated['to_queue_uuid'] ?? '',
                 $validated['reason'] ?? null,
                 $actor,
             ),
             default => abort(422, 'Unknown action.'),
         };
     }
+
+    protected function handleTransfer(
+        Ticket $ticket,
+        Counter $counter,
+        string $toQueueUuid,
+        ?string $reason,
+        string $actor,
+    ): Ticket {
+        abort_if($toQueueUuid === '', 422, 'to_queue_uuid is required for transfer.');
+
+        $toQueue = ServiceQueue::where('uuid', $toQueueUuid)->firstOrFail();
+
+        return $this->engine->transfer($ticket, $toQueue, $counter, $reason, $actor);
+    }
 }
diff --git a/app/Http/Controllers/Api/TicketController.php b/app/Http/Controllers/Api/TicketController.php
index c8e7f18..424294c 100644
--- a/app/Http/Controllers/Api/TicketController.php
+++ b/app/Http/Controllers/Api/TicketController.php
@@ -101,12 +101,20 @@ class TicketController extends Controller
         $actor = $this->ownerRef($request);
 
         $validated = $request->validate([
-            'action' => ['required', 'string', 'in:recall,start,hold,skip,complete,no_show,cancel,delay'],
+            'action' => ['required', 'string', 'in:recall,start,hold,skip,complete,no_show,cancel,delay,transfer'],
             'minutes' => ['nullable', 'integer', 'min:5', 'max:120'],
-            'to_queue_id' => ['nullable', 'uuid'],
+            'to_queue_id' => ['required_if:action,transfer', 'nullable', 'uuid'],
             'reason' => ['nullable', 'string', 'max:500'],
         ]);
 
+        if ($validated['action'] === 'transfer') {
+            $toQueue = ServiceQueue::where('uuid', $validated['to_queue_id'])->firstOrFail();
+            $this->authorizeOwner($request, $toQueue);
+            $result = $this->engine->transfer($ticket, $toQueue, null, $validated['reason'] ?? null, $actor);
+
+            return response()->json(['data' => TicketPresenter::toArray($result->load(['serviceQueue', 'counter']))]);
+        }
+
         $result = match ($validated['action']) {
             'recall' => $this->engine->recall($ticket, $actor),
             'start' => $this->engine->startServing($ticket, $actor),
@@ -119,11 +127,6 @@ class TicketController extends Controller
             default => $ticket,
         };
 
-        if ($validated['action'] === 'transfer' && ! empty($validated['to_queue_id'])) {
-            $toQueue = ServiceQueue::where('uuid', $validated['to_queue_id'])->firstOrFail();
-            $result = $this->engine->transfer($ticket, $toQueue, null, $validated['reason'] ?? null, $actor);
-        }
-
         return response()->json(['data' => TicketPresenter::toArray($result->load(['serviceQueue', 'counter']))]);
     }
 }
diff --git a/app/Http/Controllers/Qms/ConsoleController.php b/app/Http/Controllers/Qms/ConsoleController.php
index a17b318..d2de24e 100644
--- a/app/Http/Controllers/Qms/ConsoleController.php
+++ b/app/Http/Controllers/Qms/ConsoleController.php
@@ -61,37 +61,45 @@ class ConsoleController extends Controller
             'action' => ['required', 'string'],
             'queue_id' => ['nullable', 'integer'],
             'ticket_id' => ['nullable', 'integer'],
-            'to_queue_id' => ['nullable', 'integer'],
+            'to_queue_id' => ['required_if:action,transfer', 'nullable', 'integer'],
             'reason' => ['nullable', 'string', 'max:500'],
         ]);
 
-        match ($validated['action']) {
-            'call_next' => $this->handleCallNext($counter, (int) $validated['queue_id'], $actor),
-            'recall' => $this->handleTicketAction($validated['ticket_id'], 'recall', $actor),
-            'start' => $this->handleTicketAction($validated['ticket_id'], 'start', $actor),
-            'hold' => $this->handleTicketAction($validated['ticket_id'], 'hold', $actor),
-            'skip' => $this->handleTicketAction($validated['ticket_id'], 'skip', $actor),
-            'complete' => $this->handleTicketAction($validated['ticket_id'], 'complete', $actor),
-            'no_show' => $this->handleTicketAction($validated['ticket_id'], 'no_show', $actor),
-            'transfer' => $this->handleTransfer($validated['ticket_id'], (int) $validated['to_queue_id'], $counter, $validated['reason'] ?? null, $actor),
-            'available' => $counter->update(['status' => 'available']),
-            'offline' => $counter->update(['status' => 'offline']),
-            default => null,
-        };
+        try {
+            $message = match ($validated['action']) {
+                'call_next' => $this->handleCallNext($counter, (int) $validated['queue_id'], $actor),
+                'recall' => $this->handleTicketAction($validated['ticket_id'], 'recall', $actor),
+                'start' => $this->handleTicketAction($validated['ticket_id'], 'start', $actor),
+                'hold' => $this->handleTicketAction($validated['ticket_id'], 'hold', $actor),
+                'skip' => $this->handleTicketAction($validated['ticket_id'], 'skip', $actor),
+                'complete' => $this->handleTicketAction($validated['ticket_id'], 'complete', $actor),
+                'no_show' => $this->handleTicketAction($validated['ticket_id'], 'no_show', $actor),
+                'transfer' => $this->handleTransfer($validated['ticket_id'], (int) $validated['to_queue_id'], $counter, $validated['reason'] ?? null, $actor),
+                'available' => tap(null, fn () => $counter->update(['status' => 'available'])),
+                'offline' => tap(null, fn () => $counter->update(['status' => 'offline'])),
+                default => null,
+            };
+        } catch (\RuntimeException $e) {
+            return back()->with('error', $e->getMessage());
+        }
 
-        return back();
+        return $message
+            ? back()->with('success', $message)
+            : back();
     }
 
-    protected function handleCallNext(Counter $counter, int $queueId, string $actor): void
+    protected function handleCallNext(Counter $counter, int $queueId, string $actor): ?string
     {
         $queue = ServiceQueue::findOrFail($queueId);
-        $this->engine->callNext($queue, $counter, $actor);
+        $ticket = $this->engine->callNext($queue, $counter, $actor);
+
+        return $ticket ? "Called {$ticket->ticket_number}." : 'No tickets waiting in that queue.';
     }
 
-    protected function handleTicketAction(?int $ticketId, string $action, string $actor): void
+    protected function handleTicketAction(?int $ticketId, string $action, string $actor): ?string
     {
         if (! $ticketId) {
-            return;
+            return null;
         }
         $ticket = Ticket::findOrFail($ticketId);
         match ($action) {
@@ -103,15 +111,28 @@ class ConsoleController extends Controller
             'no_show' => $this->engine->markNoShow($ticket, $actor),
             default => null,
         };
+
+        return null;
     }
 
-    protected function handleTransfer(?int $ticketId, int $toQueueId, Counter $counter, ?string $reason, string $actor): void
+    protected function handleTransfer(?int $ticketId, int $toQueueId, Counter $counter, ?string $reason, string $actor): ?string
     {
         if (! $ticketId || ! $toQueueId) {
-            return;
+            return null;
         }
         $ticket = Ticket::findOrFail($ticketId);
         $toQueue = ServiceQueue::findOrFail($toQueueId);
+
+        if (
+            $toQueue->organization_id !== $counter->organization_id
+            || $toQueue->branch_id !== $counter->branch_id
+            || $toQueue->owner_ref !== $counter->owner_ref
+        ) {
+            throw new \RuntimeException('You can only hand off to queues at this branch.');
+        }
+
         $this->engine->transfer($ticket, $toQueue, $counter, $reason, $actor);
+
+        return "Handed off {$ticket->ticket_number} to {$toQueue->name}. Ticket number unchanged.";
     }
 }
diff --git a/app/Http/Controllers/Qms/TicketController.php b/app/Http/Controllers/Qms/TicketController.php
index bb93fc1..85fbf7a 100644
--- a/app/Http/Controllers/Qms/TicketController.php
+++ b/app/Http/Controllers/Qms/TicketController.php
@@ -92,7 +92,13 @@ class TicketController extends Controller
         $this->authorizeAbility($request, 'tickets.view');
         $this->authorizeOwner($request, $ticket);
 
-        $ticket->load(['serviceQueue', 'counter', 'events']);
+        $ticket->load([
+            'serviceQueue',
+            'counter',
+            'events',
+            'transfers.fromQueue',
+            'transfers.toQueue',
+        ]);
 
         return view('qms.tickets.show', [
             'ticket' => $ticket,
diff --git a/app/Models/Ticket.php b/app/Models/Ticket.php
index 878b9ca..e39fdaa 100644
--- a/app/Models/Ticket.php
+++ b/app/Models/Ticket.php
@@ -66,4 +66,9 @@ class Ticket extends Model
     {
         return $this->hasMany(TicketEvent::class, 'ticket_id');
     }
+
+    public function transfers(): HasMany
+    {
+        return $this->hasMany(TicketTransfer::class, 'ticket_id')->orderByDesc('transferred_at');
+    }
 }
diff --git a/app/Models/TicketTransfer.php b/app/Models/TicketTransfer.php
new file mode 100644
index 0000000..b64a944
--- /dev/null
+++ b/app/Models/TicketTransfer.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Concerns\BelongsToOwner;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TicketTransfer extends Model
+{
+    use BelongsToOwner;
+
+    protected $table = 'queue_ticket_transfers';
+
+    public $timestamps = false;
+
+    protected $fillable = [
+        'owner_ref',
+        'ticket_id',
+        'from_service_queue_id',
+        'to_service_queue_id',
+        'from_counter_id',
+        'reason',
+        'transferred_by',
+        'transferred_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'transferred_at' => 'datetime',
+        ];
+    }
+
+    public function ticket(): BelongsTo
+    {
+        return $this->belongsTo(Ticket::class, 'ticket_id');
+    }
+
+    public function fromQueue(): BelongsTo
+    {
+        return $this->belongsTo(ServiceQueue::class, 'from_service_queue_id');
+    }
+
+    public function toQueue(): BelongsTo
+    {
+        return $this->belongsTo(ServiceQueue::class, 'to_service_queue_id');
+    }
+
+    public function fromCounter(): BelongsTo
+    {
+        return $this->belongsTo(Counter::class, 'from_counter_id');
+    }
+}
diff --git a/app/Services/Qms/QueueEngine.php b/app/Services/Qms/QueueEngine.php
index 42a3ba9..efaf745 100644
--- a/app/Services/Qms/QueueEngine.php
+++ b/app/Services/Qms/QueueEngine.php
@@ -230,35 +230,89 @@ class QueueEngine
         ?string $reason = null,
         ?string $actorRef = null,
     ): Ticket {
-        $fromQueueId = $ticket->service_queue_id;
+        return DB::transaction(function () use ($ticket, $toQueue, $counter, $reason, $actorRef) {
+            $ticket = Ticket::query()->lockForUpdate()->findOrFail($ticket->id);
+            $toQueue = ServiceQueue::query()->lockForUpdate()->findOrFail($toQueue->id);
 
-        $ticket->update([
-            'service_queue_id' => $toQueue->id,
-            'branch_id' => $toQueue->branch_id,
-            'status' => 'waiting',
-            'counter_id' => null,
-            'called_at' => null,
-            'serving_started_at' => null,
-        ]);
+            if ($toQueue->id === $ticket->service_queue_id) {
+                throw new \RuntimeException('Ticket is already in that queue.');
+            }
 
-        DB::table('queue_ticket_transfers')->insert([
-            'owner_ref' => $ticket->owner_ref,
-            'ticket_id' => $ticket->id,
-            'from_service_queue_id' => $fromQueueId,
-            'to_service_queue_id' => $toQueue->id,
-            'from_counter_id' => $counter?->id,
-            'reason' => $reason,
-            'transferred_by' => $actorRef,
-            'transferred_at' => now(),
-        ]);
+            if ($ticket->organization_id !== $toQueue->organization_id || $ticket->owner_ref !== $toQueue->owner_ref) {
+                throw new \RuntimeException('Cannot hand off to a queue outside this organization.');
+            }
 
-        $this->recordEvent($ticket, 'transferred', $actorRef, $counter?->id, [
-            'to_queue_id' => $toQueue->id,
-            'reason' => $reason,
-        ]);
-        $this->audit($ticket, 'ticket.transferred', $actorRef, ['to_queue' => $toQueue->name]);
+            if (! $toQueue->is_active || $toQueue->is_paused) {
+                throw new \RuntimeException('Target queue is not accepting tickets.');
+            }
 
-        return $ticket->fresh(['serviceQueue']);
+            if ($toQueue->max_capacity) {
+                $waiting = Ticket::query()
+                    ->where('service_queue_id', $toQueue->id)
+                    ->whereIn('status', ['waiting', 'called', 'serving', 'on_hold'])
+                    ->count();
+                if ($waiting >= $toQueue->max_capacity) {
+                    throw new \RuntimeException('Target queue has reached maximum capacity.');
+                }
+            }
+
+            $fromQueueId = $ticket->service_queue_id;
+            $fromCounterId = $counter?->id ?? $ticket->counter_id;
+            $ticketNumber = $ticket->ticket_number;
+
+            $waitingCount = Ticket::query()
+                ->where('service_queue_id', $toQueue->id)
+                ->where('status', 'waiting')
+                ->count();
+            $estimatedWait = $waitingCount * (int) $toQueue->avg_service_seconds;
+
+            // Same ticket row and number — only the queue assignment changes.
+            $ticket->update([
+                'service_queue_id' => $toQueue->id,
+                'branch_id' => $toQueue->branch_id,
+                'status' => 'waiting',
+                'position' => $waitingCount + 1,
+                'estimated_wait_seconds' => $estimatedWait,
+                'counter_id' => null,
+                'called_at' => null,
+                'serving_started_at' => null,
+                'completed_at' => null,
+            ]);
+
+            if ($fromCounterId) {
+                Counter::where('id', $fromCounterId)->update(['status' => 'available']);
+            }
+
+            app(ServiceSessionTracker::class)->endForTicket($ticket);
+
+            DB::table('queue_ticket_transfers')->insert([
+                'owner_ref' => $ticket->owner_ref,
+                'ticket_id' => $ticket->id,
+                'from_service_queue_id' => $fromQueueId,
+                'to_service_queue_id' => $toQueue->id,
+                'from_counter_id' => $fromCounterId,
+                'reason' => $reason,
+                'transferred_by' => $actorRef,
+                'transferred_at' => now(),
+            ]);
+
+            $this->recordEvent($ticket, 'transferred', $actorRef, $fromCounterId, [
+                'from_queue_id' => $fromQueueId,
+                'to_queue_id' => $toQueue->id,
+                'ticket_number' => $ticketNumber,
+                'reason' => $reason,
+            ]);
+            $this->audit($ticket, 'ticket.transferred', $actorRef, [
+                'to_queue' => $toQueue->name,
+                'ticket_number' => $ticketNumber,
+            ]);
+
+            $ticket = $ticket->fresh(['serviceQueue', 'counter']);
+            app(QueueNotificationService::class)->ticketTransferred($ticket);
+            $this->notifyWaitingPositions($toQueue);
+
+            return $ticket;
+        });
     }
 
     public function pauseQueue(ServiceQueue $queue, ?string $actorRef = null): ServiceQueue
diff --git a/app/Services/Qms/QueueNotificationService.php b/app/Services/Qms/QueueNotificationService.php
index 928793c..a8c37d8 100644
--- a/app/Services/Qms/QueueNotificationService.php
+++ b/app/Services/Qms/QueueNotificationService.php
@@ -44,6 +44,11 @@ class QueueNotificationService
         $this->notify($ticket, 'missed', $this->message('missed', $ticket));
     }
 
+    public function ticketTransferred(Ticket $ticket): void
+    {
+        $this->notify($ticket, 'transferred', $this->message('transferred', $ticket));
+    }
+
     public function appointmentReminder(\App\Models\QueueAppointment $appointment): void
     {
         $message = "Reminder: your appointment at {$appointment->scheduled_at->format('M j, H:i')} is coming up. Ref: {$appointment->reference}";
diff --git a/config/qms.php b/config/qms.php
index f330e6d..7d041fe 100644
--- a/config/qms.php
+++ b/config/qms.php
@@ -162,6 +162,7 @@ return [
         'almost_ready' => 'Ticket :ticket — you are :ahead customer(s) away. Please head to the waiting area.',
         'completed' => 'Thank you for visiting. Ticket :ticket is complete. Share feedback: :feedback_url',
         'missed' => 'Ticket :ticket was marked as missed. Please rejoin the queue if you still need service.',
+        'transferred' => 'Ticket :ticket has been handed off to :queue. Keep your ticket — your number stays the same.',
     ],
 
     'report_types' => [
diff --git a/resources/views/qms/console/show.blade.php b/resources/views/qms/console/show.blade.php
index bb1d0c6..2835218 100644
--- a/resources/views/qms/console/show.blade.php
+++ b/resources/views/qms/console/show.blade.php
@@ -14,6 +14,13 @@
     </div>
   </div>
 
+  @if (session('success'))
+    <p class="mt-4 rounded-lg bg-emerald-50 px-3 py-2 text-sm text-emerald-800">{{ session('success') }}</p>
+  @endif
+  @if (session('error'))
+    <p class="mt-4 rounded-lg bg-rose-50 px-3 py-2 text-sm text-rose-800">{{ session('error') }}</p>
+  @endif
+
   @if ($currentTicket)
     <section class="mt-6 overflow-hidden rounded-2xl border border-indigo-200 bg-gradient-to-br from-indigo-50 via-white to-white shadow-sm">
       <div class="border-b border-indigo-100 px-6 py-4">
@@ -47,26 +54,33 @@
           @endforeach
         </div>
 
-        @if ($allQueues->count() > 1)
-          <form method="POST" action="{{ route('qms.console.action', $counter) }}" class="mt-4 flex flex-wrap items-end gap-2 border-t border-indigo-100 pt-4">
+        @php
+          $handoffQueues = $allQueues->where('id', '!=', $currentTicket->service_queue_id)->values();
+        @endphp
+        @if ($handoffQueues->isNotEmpty())
+          <form method="POST" action="{{ route('qms.console.action', $counter) }}" class="mt-4 border-t border-indigo-100 pt-4">
             @csrf
             <input type="hidden" name="action" value="transfer">
             <input type="hidden" name="ticket_id" value="{{ $currentTicket->id }}">
-            <div class="min-w-[12rem] flex-1">
-              <label class="block text-xs font-medium text-slate-500">Transfer to queue</label>
-              <select name="to_queue_id" class="mt-1 w-full rounded-lg border-slate-300 text-sm">
-                @foreach ($allQueues as $q)
-                  @if ($q->id !== $currentTicket->service_queue_id)
-                    <option value="{{ $q->id }}">{{ $q->name }}</option>
-                  @endif
-                @endforeach
-              </select>
+            <div class="mb-3">
+              <p class="text-sm font-medium text-slate-800">Hand off to another queue</p>
+              <p class="mt-1 text-xs text-slate-500">Sends this customer to the next service while keeping ticket <span class="font-mono font-semibold text-slate-700">{{ $currentTicket->ticket_number }}</span>.</p>
             </div>
-            <div class="min-w-[12rem] flex-1">
-              <label class="block text-xs font-medium text-slate-500">Reason (optional)</label>
-              <input type="text" name="reason" placeholder="e.g. Specialist required" class="mt-1 w-full rounded-lg border-slate-300 text-sm">
+            <div class="flex flex-wrap items-end gap-2">
+              <div class="min-w-[12rem] flex-1">
+                <label class="block text-xs font-medium text-slate-500">Next queue</label>
+                <select name="to_queue_id" required class="mt-1 w-full rounded-lg border-slate-300 text-sm">
+                  @foreach ($handoffQueues as $q)
+                    <option value="{{ $q->id }}">{{ $q->name }} ({{ $q->prefix }})</option>
+                  @endforeach
+                </select>
+              </div>
+              <div class="min-w-[12rem] flex-1">
+                <label class="block text-xs font-medium text-slate-500">Reason (optional)</label>
+                <input type="text" name="reason" placeholder="e.g. Lab tests needed" class="mt-1 w-full rounded-lg border-slate-300 text-sm">
+              </div>
+              <button type="submit" class="btn-primary text-sm">Hand off</button>
             </div>
-            <button type="submit" class="btn-secondary text-sm">Transfer ticket</button>
           </form>
         @endif
       </div>
diff --git a/resources/views/qms/tickets/show.blade.php b/resources/views/qms/tickets/show.blade.php
index 1c36246..28e58ae 100644
--- a/resources/views/qms/tickets/show.blade.php
+++ b/resources/views/qms/tickets/show.blade.php
@@ -17,5 +17,29 @@
                 <a href="{{ route('qms.tickets.index') }}" class="btn-primary">All tickets</a>
             </div>
         </div>
+
+        @if ($ticket->transfers->isNotEmpty())
+            <div class="mt-4 rounded-2xl bg-white p-6 shadow-sm">
+                <h2 class="text-sm font-semibold text-slate-900">Hand-off history</h2>
+                <p class="mt-1 text-xs text-slate-500">Ticket number stays {{ $ticket->ticket_number }} across each hand-off.</p>
+                <ul class="mt-4 divide-y divide-slate-100">
+                    @foreach ($ticket->transfers as $transfer)
+                        <li class="py-3 text-sm">
+                            <p class="font-medium text-slate-800">
+                                {{ $transfer->fromQueue?->name ?? 'Queue' }}
+                                →
+                                {{ $transfer->toQueue?->name ?? 'Queue' }}
+                            </p>
+                            <p class="mt-1 text-xs text-slate-500">
+                                {{ $transfer->transferred_at?->format('M j, Y H:i') }}
+                                @if ($transfer->reason)
+                                    · {{ $transfer->reason }}
+                                @endif
+                            </p>
+                        </li>
+                    @endforeach
+                </ul>
+            </div>
+        @endif
     </div>
 </x-app-layout>
diff --git a/tests/Feature/QmsQueueTest.php b/tests/Feature/QmsQueueTest.php
index bbd7b09..c16cdd3 100644
--- a/tests/Feature/QmsQueueTest.php
+++ b/tests/Feature/QmsQueueTest.php
@@ -157,6 +157,64 @@ class QmsQueueTest extends TestCase
         $this->assertNotNull($session->ended_at);
     }
 
+    public function test_handoff_keeps_ticket_number_and_frees_counter(): void
+    {
+        [$user, $org, $branch, $queue] = $this->setUpOrg();
+        $lab = ServiceQueue::create([
+            'owner_ref' => $user->public_id,
+            'organization_id' => $org->id,
+            'branch_id' => $branch->id,
+            'name' => 'Lab',
+            'prefix' => 'L',
+            'strategy' => 'fifo',
+            'is_active' => true,
+        ]);
+
+        $engine = app(QueueEngine::class);
+        $ticket = $engine->issueTicket($queue, $user->public_id, [
+            'source' => 'reception',
+            'customer_name' => 'Patient One',
+        ]);
+        $this->assertSame('A001', $ticket->ticket_number);
+
+        $counter = \App\Models\Counter::create([
+            'owner_ref' => $user->public_id,
+            'organization_id' => $org->id,
+            'branch_id' => $branch->id,
+            'name' => 'Doctor 1',
+            'status' => 'available',
+            'is_active' => true,
+        ]);
+
+        $engine->callTicket($ticket, $counter, $user->public_id);
+        $engine->startServing($ticket->fresh(), $user->public_id);
+
+        $handedOff = $engine->transfer(
+            $ticket->fresh(),
+            $lab,
+            $counter,
+            'Lab tests needed',
+            $user->public_id,
+        );
+
+        $this->assertSame('A001', $handedOff->ticket_number);
+        $this->assertSame($lab->id, $handedOff->service_queue_id);
+        $this->assertSame('waiting', $handedOff->status);
+        $this->assertNull($handedOff->counter_id);
+        $this->assertNull($handedOff->completed_at);
+        $this->assertSame('available', $counter->fresh()->status);
+        $this->assertDatabaseHas('queue_ticket_transfers', [
+            'ticket_id' => $ticket->id,
+            'from_service_queue_id' => $queue->id,
+            'to_service_queue_id' => $lab->id,
+            'reason' => 'Lab tests needed',
+        ]);
+
+        $session = \App\Models\ServiceSession::where('ticket_id', $ticket->id)->first();
+        $this->assertNotNull($session);
+        $this->assertNotNull($session->ended_at);
+    }
+
     public function test_reports_sqlite_compatible(): void
     {
         [$user, $org, , $queue] = $this->setUpOrg();