diff --git a/app/routes/test_rda.py b/app/routes/test_rda.py
index 4b0dd26..d853584 100644
--- a/app/routes/test_rda.py
+++ b/app/routes/test_rda.py
@@ -72,7 +72,7 @@ async def test_page(request: Request, user: dict = Depends(get_current_user)):
 
 @router.get("/candidatos")
 async def get_candidatos(request: Request, user: dict = Depends(get_current_user),
-                         contrato: str = "", factura: str = ""):
+                         contrato: str = "", factura: str = "", articulos: str = ""):
     db = get_connection()
     cfg = {r[0]: r[1] for r in db.execute("SELECT key, value FROM config").fetchall()}
     db.close()
@@ -81,9 +81,19 @@ async def get_candidatos(request: Request, user: dict = Depends(get_current_user
     if not fb_ok:
         return JSONResponse({"error": f"Error Firebird: {fb_msg}"})
 
-    sql = _SQL_CANDIDATOS
+    # Artículos configurados con especialidad en TNS
+    arts_default = "CH4,CREA,TGP,VSG,PCR,AU,FER,TPO,TSH,TGO,GLI,BUN,COL,TRI,HDL,LDL,HBA1,VB12,VITD,PO,FER,K,NA,MG,URO,PRL,TSH,T4L,T3,T4,T3L,HIV,VDRL,PSA,AFP,CEA,CA125,CA199,FV,TP,TPT"
+    arts_str = articulos.strip() if articulos.strip() else arts_default
+    arts_list = [a.strip().upper() for a in arts_str.split(",") if a.strip()]
+    arts_in = ", ".join(f"'{a}'" for a in arts_list)
+
+    filtros = [
+        "r.NUM_FACTURA > 0",
+        "e.CODCONTRATO IS NOT NULL",
+        "TRIM(e.CODCONTRATO) <> ''",
+        f"rel.COD_EXAMEN IN ({arts_in})",
+    ]
     params = {}
-    filtros = ["r.NUM_FACTURA > 0", "e.CODCONTRATO IS NOT NULL", "TRIM(e.CODCONTRATO) <> ''"]
     if contrato:
         filtros.append("e.CODCONTRATO = :contrato")
         params["contrato"] = contrato
@@ -92,10 +102,11 @@ async def get_candidatos(request: Request, user: dict = Depends(get_current_user
         params["factura"] = int(factura)
 
     sql_final = """
-    SELECT FIRST 100
+    SELECT FIRST 10
         r.IDRECEPCION, r.NUM_FACTURA, r.FECHA_RECEPCION, r.COD_PACIENTE, r.NIT_EMPRESA,
-        e.CODCONTRATO, LIST(DISTINCT rel.COD_EXAMEN, ', ') AS examenes,
-        COUNT(DISTINCT rel.COD_EXAMEN) AS total_examenes
+        e.CODCONTRATO,
+        LIST(DISTINCT rel.COD_EXAMEN, ', ') AS EXAMENES,
+        COUNT(DISTINCT rel.COD_EXAMEN) AS TOTAL_EXAMENES
     FROM RECEPCION r
     JOIN RELACION rel ON rel.IDRECEPCION = r.IDRECEPCION
     LEFT JOIN EMPRESA e ON e.NIT = r.NIT_EMPRESA
@@ -119,8 +130,8 @@ async def get_candidatos(request: Request, user: dict = Depends(get_current_user
             "paciente": row.get("COD_PACIENTE", ""),
             "empresa": row.get("NIT_EMPRESA", ""),
             "contrato": row.get("CODCONTRATO", ""),
-            "examenes": row.get("examenes", ""),
-            "total": row.get("total_examenes", 0),
+            "examenes": row.get("EXAMENES", ""),
+            "total": row.get("TOTAL_EXAMENES", 0),
         })
 
     return JSONResponse({"candidatos": candidatos})
diff --git a/app/templates/test_rda.html b/app/templates/test_rda.html
index 4a4d9fe..0f5a1f4 100644
--- a/app/templates/test_rda.html
+++ b/app/templates/test_rda.html
@@ -8,11 +8,12 @@
   <div class="bg-white rounded-xl shadow-sm border border-gray-200">
     <div class="px-6 py-4 border-b border-gray-200 flex items-center justify-between">
       <h3 class="font-semibold text-gray-800"><i class="fas fa-list mr-2 text-blue-500"></i>Candidatos disponibles</h3>
-      <div class="flex gap-2 items-center">
+      <div class="flex gap-2 items-center flex-wrap">
         <input id="filtro-contrato" type="text" placeholder="Contrato (ej: 011)"
           class="px-3 py-1.5 border border-gray-300 rounded-lg text-sm w-32">
-        <input id="filtro-factura" type="text" placeholder="Factura (ej: 3990)"
-          class="px-3 py-1.5 border border-gray-300 rounded-lg text-sm w-36">
+        <input id="filtro-articulos" type="text" placeholder="Artículos (ej: CH4,TSH,GLI)"
+          class="px-3 py-1.5 border border-gray-300 rounded-lg text-sm w-56"
+          title="Filtrar por artículos configurados en TNS. Vacío = lista predeterminada.">
         <button onclick="cargarCandidatos()"
           class="px-4 py-1.5 bg-blue-600 text-white rounded-lg text-sm hover:bg-blue-700">
           <i class="fas fa-search mr-1"></i> Buscar
@@ -85,14 +86,14 @@
 <script>
 async function cargarCandidatos() {
   const contrato = document.getElementById('filtro-contrato').value.trim();
-  const factura = document.getElementById('filtro-factura').value.trim();
+  const articulos = document.getElementById('filtro-articulos').value.trim();
   document.getElementById('cargando-candidatos').classList.remove('hidden');
   document.getElementById('tabla-candidatos').classList.add('hidden');
   document.getElementById('sin-candidatos').classList.add('hidden');
 
   const params = new URLSearchParams();
   if (contrato) params.append('contrato', contrato);
-  if (factura) params.append('factura', factura);
+  if (articulos) params.append('articulos', articulos);
 
   const resp = await fetch('/test-rda/candidatos?' + params.toString());
   const data = await resp.json();